There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude, >depending on how you feel about these things. He called it stimulated >emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
https://www.hrl.com/
Some details:
https://www.aps.org/archives/publications/apsnews/200312/history.cfm
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
Einstein, in one of his fits of genius, predicted in around 1916 thathttps://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude, >>depending on how you feel about these things. He called it stimulated >>emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
Einstein, in one of his fits of genius, predicted in around 1916 that >>>under the right conditions, a photon could pass by an excited atom and >>>the atom would kick in another photon, or add to the wave amplitude, >>>depending on how you feel about these things. He called it stimulated >>>emission. He also declared that the laws of thermodynamics made this >>>effect impossible to use in practical situations.https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>>
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
Keep your mind on electronics, young man.
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too, up the road a bit.
On Fri, 21 Jun 2024 11:32:56 -0700, john larkin <jl@650pot.com> wrote:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>under the right conditions, a photon could pass by an excited atom and >>>>the atom would kick in another photon, or add to the wave amplitude, >>>>depending on how you feel about these things. He called it stimulated >>>>emission. He also declared that the laws of thermodynamics made this >>>>effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>maser, a gaseous microwave oscillator. His superiors thought he was >>>>crazy to dispute Einstein and almost threw him out of grad school, but >>>>it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
Keep your mind on electronics, young man.
My apologies, John. A rather obscure British cultural reference which
you wouldn't understand. Perhaps some British posters will recognize
it; we'll see.....
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too, up the road a bit.
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
Einstein, in one of his fits of genius, predicted in around 1916 that >>>under the right conditions, a photon could pass by an excited atom and >>>the atom would kick in another photon, or add to the wave amplitude, >>>depending on how you feel about these things. He called it stimulated >>>emission. He also declared that the laws of thermodynamics made this >>>effect impossible to use in practical situations.https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>>
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
Keep your mind on electronics, young man.
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too, up the road a bit.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john larkin <jl@650pot.com> wrote in <1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>under the right conditions, a photon could pass by an excited atom and >>>>the atom would kick in another photon, or add to the wave amplitude, >>>>depending on how you feel about these things. He called it stimulated >>>>emission. He also declared that the laws of thermodynamics made this >>>>effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>maser, a gaseous microwave oscillator. His superiors thought he was >>>>crazy to dispute Einstein and almost threw him out of grad school, but >>>>it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john larkin
<jl@650pot.com> wrote in <1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle duality. >>>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>>under the right conditions, a photon could pass by an excited atom and >>>>>the atom would kick in another photon, or add to the wave amplitude, >>>>>depending on how you feel about these things. He called it stimulated >>>>>emission. He also declared that the laws of thermodynamics made this >>>>>effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>maser, a gaseous microwave oscillator. His superiors thought he was >>>>>crazy to dispute Einstein and almost threw him out of grad school, but >>>>>it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built >>>>>a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, too, >>>up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in <v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>that under the right conditions, a photon could pass by an excited >>>>>>atom and the atom would kick in another photon, or add to the wave >>>>>>amplitude, depending on how you feel about these things. He called >>>>>>it stimulated emission. He also declared that the laws of >>>>>>thermodynamics made this effect impossible to use in practical >>>>>>situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>crazy to dispute Einstein and almost threw him out of grad school, >>>>>>but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>that under the right conditions, a photon could pass by an excited >>>>>>>atom and the atom would kick in another photon, or add to the wave >>>>>>>amplitude, depending on how you feel about these things. He called >>>>>>>it stimulated emission. He also declared that the laws of >>>>>>>thermodynamics made this effect impossible to use in practical >>>>>>>situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>>Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing?
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that, >clearly. It obviously wasn't publicised in Holland.
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom <cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom >>>>>><cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>duality.Wasn't that where Jane Mansfield used to go out bathing?
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>that under the right conditions, a photon could pass by an excited >>>>>>>>atom and the atom would kick in another photon, or add to the wave >>>>>>>>amplitude, depending on how you feel about these things. He called >>>>>>>>it stimulated emission. He also declared that the laws of >>>>>>>>thermodynamics made this effect impossible to use in practical >>>>>>>>situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>maser, a gaseous microwave oscillator. His superiors thought he >>>>>>>>was crazy to dispute Einstein and almost threw him out of grad >>>>>>>>school, but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and >>>>>>>>Bell Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters
when she went out bathing in Malibu. But you don't know anything about >>that, clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
On Sun, 23 Jun 2024 09:45:07 -0700, john larkin wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom >>>>>>><cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>>duality.Wasn't that where Jane Mansfield used to go out bathing?
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>>0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>that under the right conditions, a photon could pass by an excited >>>>>>>>>atom and the atom would kick in another photon, or add to the wave >>>>>>>>>amplitude, depending on how you feel about these things. He called >>>>>>>>>it stimulated emission. He also declared that the laws of >>>>>>>>>thermodynamics made this effect impossible to use in practical >>>>>>>>>situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>>maser, a gaseous microwave oscillator. His superiors thought he >>>>>>>>>was crazy to dispute Einstein and almost threw him out of grad >>>>>>>>>school, but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and >>>>>>>>>Bell Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters
when she went out bathing in Malibu. But you don't know anything about >>>that, clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
I know, John. My apologies. It's just that Jan keeps banging on about >lobsters and I got side-tracked.
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom <cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>> wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com>Keep your mind on electronics, young man.
wrote:
There was a thread somewhere above about photon wave/particleWasn't that where Jane Mansfield used to go out bathing?
duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>> 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>> that under the right conditions, a photon could pass by an excited >>>>>>>> atom and the atom would kick in another photon, or add to the wave >>>>>>>> amplitude, depending on how you feel about these things. He called >>>>>>>> it stimulated emission. He also declared that the laws of
thermodynamics made this effect impossible to use in practical >>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>> crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>> but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>>> Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
john larkin <jl@650pot.com> wrote:dp/
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom
<cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/
Well, Schawlow famously said, “Anything will lase, if you hit it hard enough.”0195153766
Keep your mind on electronics, young man.Wasn't that where Jane Mansfield used to go out bathing?
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>> that under the right conditions, a photon could pass by an
excited atom and the atom would kick in another photon, or add >>>>>>>>> to the wave amplitude, depending on how you feel about these >>>>>>>>> things. He called it stimulated emission. He also declared that >>>>>>>>> the laws of thermodynamics made this effect impossible to use in >>>>>>>>> practical situations.
In 1951, Charles Townes invented a work-around trick and built >>>>>>>>> the maser, a gaseous microwave oscillator. His superiors thought >>>>>>>>> he was crazy to dispute Einstein and almost threw him out of >>>>>>>>> grad school, but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and >>>>>>>>> Bell Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters
when she went out bathing in Malibu. But you don't know anything about
that, clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
I expect that includes lobsters.
Cheers
Phil Hobbs
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john
larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>>> wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>> duality.Wasn't that where Jane Mansfield used to go out bathing?
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>> 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>> that under the right conditions, a photon could pass by an excited >>>>>>>>> atom and the atom would kick in another photon, or add to the wave >>>>>>>>> amplitude, depending on how you feel about these things. He called >>>>>>>>> it stimulated emission. He also declared that the laws of
thermodynamics made this effect impossible to use in practical >>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>>> crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>>> but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>>>> Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when >>> she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, Anything will lase, if you hit it hard >enough.
I expect that includes lobsters.
Cheers
Phil Hobbs
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>> larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>>>> wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>>> duality.Wasn't that where Jane Mansfield used to go out bathing?
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>>> 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>> that under the right conditions, a photon could pass by an excited >>>>>>>>>> atom and the atom would kick in another photon, or add to the wave >>>>>>>>>> amplitude, depending on how you feel about these things. He called >>>>>>>>>> it stimulated emission. He also declared that the laws of
thermodynamics made this effect impossible to use in practical >>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>>>> crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>>>> but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>>>>> Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when >>>> she went out bathing in Malibu. But you don't know anything about that, >>>> clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, Anything will lase, if you hit it hard
enough.
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>> larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>>>>> wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>>>> duality.Wasn't that where Jane Mansfield used to go out bathing?
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>>>> 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>> that under the right conditions, a photon could pass by an excited >>>>>>>>>>> atom and the atom would kick in another photon, or add to the wave >>>>>>>>>>> amplitude, depending on how you feel about these things. He called >>>>>>>>>>> it stimulated emission. He also declared that the laws of >>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>>>>> crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>>>>> but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell >>>>>>>>>>> Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when >>>>> she went out bathing in Malibu. But you don't know anything about that, >>>>> clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard
enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for >instance.
The lifetime of suitable upper states drops steeply with increasing energy, >which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >lot of other stuff going on, so it would be less noticeable.
You dont have resonators in interstellar space, so it wouldnt be highly >directional.
Cheers
Phil Hobbs
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>> larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>> wrote:Keep your mind on electronics, young man.
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>> duality.Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/ >>>>>>>> 0195153766
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>>> that under the right conditions, a photon could pass by an excited >>>>>>>>>>>> atom and the atom would kick in another photon, or add to the wave >>>>>>>>>>>> amplitude, depending on how you feel about these things. He called >>>>>>>>>>>> it stimulated emission. He also declared that the laws of >>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, >>>>>>>>>>>> but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that, >>>>>> clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard
enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for
instance.
The lifetime of suitable upper states drops steeply with increasing energy, >> which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >> lot of other stuff going on, so it would be less noticeable.
You dont have resonators in interstellar space, so it wouldnt be highly >> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Nature seems to use any effect that's not flat impossible, whether
biologists approve or not.
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>>>> that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that, >>>>>>> clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for
instance.
The lifetime of suitable upper states drops steeply with increasing energy, >>> which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >>> lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and >narrowish bandwidth, and there are no biological examples that I know of.
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened
Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>> larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com> >>>>>>>> wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>> wrote:
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>>>>> that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>> sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for
instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >>>> lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and
narrowish bandwidth, and there are no biological examples that I know of.
There are chemical lasers.
john larkin <jl@650pot.com> wrote:
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:There are chemical lasers.
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.
Einstein, in one of his fits of genius, predicted in around 1916
that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>>> sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for >>>>> instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping. >>>>>
While that can in principle happen naturally, it would be in places with a
lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>>>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and
narrowish bandwidth, and there are no biological examples that I know of. >>
And nuclear ones!
Cheers
Phil certified laser jock Hobbs
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>>>> that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around?
Na, but some other beatiful women I met.
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that, >>>>>>> clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some
sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for
instance.
The lifetime of suitable upper states drops steeply with increasing energy, >>> which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >>> lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and >narrowish bandwidth, and there are no biological examples that I know of.
Nature seems to use any effect that's not flat impossible, whether
biologists approve or not.
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude, depending on how you feel about these things. He called it stimulated emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>
Einstein, in one of his fits of genius, predicted in around 1916 >>>>>>>>>>>>>> that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu. >>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle, >>>>>>>>>>>> too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>> sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for
instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping.
While that can in principle happen naturally, it would be in places with a >>>> lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and >>narrowish bandwidth, and there are no biological examples that I know of.
Biology does make meta surfaces of various kinds, usually to make
reflectors impossible to make any other way, from beetles that look >iridescent to bird feathers.
Nature seems to use any effect that's not flat impossible, whether
biologists approve or not.
True, if there is a need. Laser eyes seem like it would attract the
wrong kind of attention.
Joe Gwinn
On 6/21/24 15:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
you could build a laser in your living room if you want to http://jarrodkinsey.org/co2laser/co2laser.html
On Mon, 24 Jun 2024 16:47:57 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:There are chemical lasers.
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote: >>>>>>>>>>>>Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.
Einstein, in one of his fits of genius, predicted in around 1916
that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have
built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>>>> sort of stimulated emission, some sort of super-fluorescence, in >>>>>>> nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for >>>>>> instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping. >>>>>>
While that can in principle happen naturally, it would be in places with a
lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly
directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and
narrowish bandwidth, and there are no biological examples that I know of. >>>
And nuclear ones!
Cheers
Phil certified laser jock Hobbs
Living things can certainly pump up molecular energy states to make
visible light. Why couldn't they produce the population inversions
that enable stimulated emission and optical gain?
Why wouldn't they?That’s more of a theological question. ;)
On Mon, 24 Jun 2024 16:22:31 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:Biology does make meta surfaces of various kinds, usually to make
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote:Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.
Einstein, in one of his fits of genius, predicted in around 1916
that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have >>>>>>>>>>>>>>> built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>>> sort of stimulated emission, some sort of super-fluorescence, in
nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for >>>>> instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping. >>>>>
While that can in principle happen naturally, it would be in places with a
lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly >>>>> directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and
narrowish bandwidth, and there are no biological examples that I know of. >>
reflectors impossible to make any other way, from beetles that look
iridescent to bird feathers.
Nature seems to use any effect that's not flat impossible, whether
biologists approve or not.
True, if there is a need. Laser eyes seem like it would attract the
wrong kind of attention.
Joe Gwinn
I was thinking of amplification to improve night vision.
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude, depending on how you feel about these things. He called it stimulated emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
On 6/25/24 00:02, john larkin wrote:
On Mon, 24 Jun 2024 16:22:31 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:Biology does make meta surfaces of various kinds, usually to make
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote: >>>>>>>>>>>>Na, but some other beatiful women I met.
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>>>> larkin <jl@650pot.com> wrote in0195153766
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>>>> wrote:
There was a thread somewhere above about photon wave/particle >>>>>>>>>>>>>>>> duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/
Keep your mind on electronics, young man.
Einstein, in one of his fits of genius, predicted in around 1916
that under the right conditions, a photon could pass by an excited
atom and the atom would kick in another photon, or add to the wave
amplitude, depending on how you feel about these things. He called
it stimulated emission. He also declared that the laws of >>>>>>>>>>>>>>>> thermodynamics made this effect impossible to use in practical >>>>>>>>>>>>>>>> situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school,
but it worked.
In 1960, Theodore Maiman at HRL made the first ruby laser, and Bell
Labs soonafter made a HeNe.
What's interesting is that any decent neon sign shop could have
built a HeNe laser in 1920.
HRL sounds like a very cool place, up in the hills above Malibu.
Wasn't that where Jane Mansfield used to go out bathing? >>>>>>>>>>>>>>>
The Getty Museum is in Malibu. Go there if you can. Hearst Castle,
too,
up the road a bit.
I've been to Malibu, even did some work there...
Did not go to any museum, but did go to the beach.
Did you see Jane? What about lobsters? Any lobsters around? >>>>>>>>>>>
Last time we went looking for edible seaweed ...
Argh! Never mind. I believe Jane had terrible problems with lobsters when
she went out bathing in Malibu. But you don't know anything about that,
clearly. It obviously wasn't publicised in Holland.
This thread is about lasers, not lobsters.
Well, Schawlow famously said, ?Anything will lase, if you hit it hard >>>>>>>> enough.?
I expect that includes lobsters.
Cheers
Phil Hobbs
But no, seriously, there must be some laser action, or at least some >>>>>>> sort of stimulated emission, some sort of super-fluorescence, in >>>>>>> nature somewhere.
Sure. Cosmic masers occur in interstellar giant molecular clouds, for >>>>>> instance.
The lifetime of suitable upper states drops steeply with increasing energy,
which means that visible laser action requires much stronger pumping. >>>>>>
While that can in principle happen naturally, it would be in places with a
lot of other stuff going on, so it would be less noticeable.
You don?t have resonators in interstellar space, so it wouldn?t be highly
directional.
Cheers
Phil Hobbs
I was thinking about a biological laser too.
I could imagine an eyeball with some sort of stimulated emission
effect, in the vitreus humor or in the retina, to improve night
vision, basically a photon amplifier.
Difficult. For a start, you need a pump source of high intensity and
narrowish bandwidth, and there are no biological examples that I know of. >>>
reflectors impossible to make any other way, from beetles that look
iridescent to bird feathers.
Nature seems to use any effect that's not flat impossible, whether
biologists approve or not.
True, if there is a need. Laser eyes seem like it would attract the
wrong kind of attention.
Joe Gwinn
I was thinking of amplification to improve night vision.
Nature chose the cheaper way: A cascade of amplifiying chemical
reactions.
Jeroen Belleman
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
A nitrogen gas UV pulsed laser is possible just by getting the pressure
right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it
sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a
spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >>
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it >>sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a >>spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
On 6/25/24 12:50, Martin Brown wrote:
On 21/06/2024 14:05, john larkin wrote:[...]
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
The idea has been around for a while. Scifi writer Larry Niven
used it in his Ringworld series of stories. (A ringworld meteorite
defence system strips bare the hull of a space ship on a collision
course with the ringworld surface.)
Jeroen Belleman
Jeroen Belleman <jeroen@nospam.please> wrote:
On 6/25/24 12:50, Martin Brown wrote:
On 21/06/2024 14:05, john larkin wrote:[...]
There was a thread somewhere above about photon wave/particle duality. >>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and >>>> the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but >>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
The idea has been around for a while. Scifi writer Larry Niven
used it in his Ringworld series of stories. (A ringworld meteorite
defence system strips bare the hull of a space ship on a collision
course with the ringworld surface.)
Jeroen Belleman
Of course the Ringworld is dynamically unstable, so it wouldn’t matter that much if it got hit. ;)
Cheers
Phil Hobbs
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it >>sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a >>spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown >><'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality. >>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and >>>> the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but >>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>>right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it >>>sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
The failure to discover fullerenes in soot was a lot more surprising >>>since they were there all the time since the invention of fire just >>>waiting to be extracted by benzene. For a long time space dust had a >>>spectrum that could not be reproduced on Earth by any known compound.https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/ >>>
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
Joe Gwinn
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality.
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and
the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but
it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure
right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it
sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a
spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality. >>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that
under the right conditions, a photon could pass by an excited atom and >>>> the atom would kick in another photon, or add to the wave amplitude,
depending on how you feel about these things. He called it stimulated
emission. He also declared that the laws of thermodynamics made this
effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but >>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object.
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built
a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure
right and creating the population inversion. Self starting - there was
a (dangerous) experiment in SciAm Amateur Scientist column to do it
sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction. >>>
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/ >>>
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a
spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
On Tue, 25 Jun 2024 17:43:56 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
I see the same thing in electronic design. People favor accepted
practice, validated in textbooks, and apply all their intelligence to
showing how new ideas won't work.
A recent case is deciding that the LC's at the output of a switching
power supply are "a filter" so must follow classical filter theory, pole-zeros and Butterworths and such. I tell them "It's just a power
supply."
On Mon, 24 Jun 2024 16:47:57 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Mon, 24 Jun 2024 00:22:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 22:09:42 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 18:08:52 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Sun, 23 Jun 2024 16:39:56 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:
On Sun, 23 Jun 2024 05:03:34 GMT, Jan Panteltje wrote:
On a sunny day (Sat, 22 Jun 2024 17:23:40 -0000 (UTC)) it happened >>>>>>>>>>> Cursitor Doom <cd999666@notformail.com> wrote in
<v571as$3rs0j$2@dont-email.me>:
On Sat, 22 Jun 2024 06:19:49 GMT, Jan Panteltje wrote: >>>>>>>>>>>>
On a sunny day (Fri, 21 Jun 2024 11:32:56 -0700) it happened john >>>>>>>>>>>>> larkin <jl@650pot.com> wrote in
<1ghb7jt3882078r19n6jjgtirv25q27805@4ax.com>:
On Fri, 21 Jun 2024 17:56:36 +0100, Cursitor Doom <cd@notformail.com>
wrote:
On Fri, 21 Jun 2024 06:05:21 -0700, john larkin <jl@650pot.com> >>>>>>>>>>>>>>> wrote:
Living things can certainly pump up molecular energy states to make
visible light. Why couldn't they produce the population inversions
that enable stimulated emission and optical gain?
Why wouldn't they?
john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 17:43:56 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality. >>>>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>>> under the right conditions, a photon could pass by an excited atom and >>>>>> the atom would kick in another photon, or add to the wave amplitude, >>>>>> depending on how you feel about these things. He called it stimulated >>>>>> emission. He also declared that the laws of thermodynamics made this >>>>>> effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>> crazy to dispute Einstein and almost threw him out of grad school, but >>>>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object. >>>>>
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built >>>>>> a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>>>> right and creating the population inversion. Self starting - there was >>>>> a (dangerous) experiment in SciAm Amateur Scientist column to do it
sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction. >>>>>
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/ >>>>>
The failure to discover fullerenes in soot was a lot more surprising >>>>> since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a >>>>> spectrum that could not be reproduced on Earth by any known compound. >>>>>
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
Joe Gwinn
I see the same thing in electronic design. People favor accepted
practice, validated in textbooks, and apply all their intelligence to
showing how new ideas won't work.
A recent case is deciding that the LC's at the output of a switching
power supply are "a filter" so must follow classical filter theory,
pole-zeros and Butterworths and such. I tell them "It's just a power
supply."
Classical filter theory is very useful for designing a power supply , as
long as you dont just wave some canned design over it like a dead chicken.
Controlling rolloff and ringing over a wide range of conditions is easier >with a bit of theoryyou can estimate the overshoot via the Q of the
network, for instance.
Canned designs such as Butterworth, Chebyshev, and so on assume constant, >resistive source and load. While thats a useful fiction in lots of >signal-level applications, its not remotely true in a power supply.
Cheers
Phil Hobbs
On Tue, 25 Jun 2024 17:43:56 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:
There was a thread somewhere above about photon wave/particle duality. >>>>>
This is worth reading:
https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>> under the right conditions, a photon could pass by an excited atom and >>>>> the atom would kick in another photon, or add to the wave amplitude, >>>>> depending on how you feel about these things. He called it stimulated >>>>> emission. He also declared that the laws of thermodynamics made this >>>>> effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the
maser, a gaseous microwave oscillator. His superiors thought he was
crazy to dispute Einstein and almost threw him out of grad school, but >>>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl
masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object. >>>>
https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S
What's interesting is that any decent neon sign shop could have built >>>>> a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though.
I know a guy who built a HeNe. It wasn't hard.
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>>> right and creating the population inversion. Self starting - there was >>>> a (dangerous) experiment in SciAm Amateur Scientist column to do it
sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction. >>>>
https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/ >>>>
The failure to discover fullerenes in soot was a lot more surprising
since they were there all the time since the invention of fire just
waiting to be extracted by benzene. For a long time space dust had a
spectrum that could not be reproduced on Earth by any known compound.
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
Joe Gwinn
I see the same thing in electronic design. People favor accepted
practice, validated in textbooks, and apply all their intelligence to
showing how new ideas won't work.
A recent case is deciding that the LC's at the output of a switching
power supply are "a filter" so must follow classical filter theory, pole-zeros and Butterworths and such. I tell them "It's just a power
supply."
On Thu, 27 Jun 2024 02:49:37 -0000 (UTC), Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 17:43:56 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote: >>>>
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:I know a guy who built a HeNe. It wasn't hard.
There was a thread somewhere above about photon wave/particle duality. >>>>>>>
This is worth reading:
< https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>>>> under the right conditions, a photon could pass by an excited atom and >>>>>>> the atom would kick in another photon, or add to the wave amplitude, >>>>>>> depending on how you feel about these things. He called it stimulated >>>>>>> emission. He also declared that the laws of thermodynamics made this >>>>>>> effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>> crazy to dispute Einstein and almost threw him out of grad school, but >>>>>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl >>>>>> masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object. >>>>>>
< https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S>
What's interesting is that any decent neon sign shop could have built >>>>>>> a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though. >>>>>
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>>>>> right and creating the population inversion. Self starting - there was >>>>>> a (dangerous) experiment in SciAm Amateur Scientist column to do it >>>>>> sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction. >>>>>>
< https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/>
The failure to discover fullerenes in soot was a lot more surprising >>>>>> since they were there all the time since the invention of fire just >>>>>> waiting to be extracted by benzene. For a long time space dust had a >>>>>> spectrum that could not be reproduced on Earth by any known compound. >>>>>>
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
Joe Gwinn
I see the same thing in electronic design. People favor accepted
practice, validated in textbooks, and apply all their intelligence to
showing how new ideas won't work.
A recent case is deciding that the LC's at the output of a switching
power supply are "a filter" so must follow classical filter theory,
pole-zeros and Butterworths and such. I tell them "It's just a power
supply."
Classical filter theory is very useful for designing a power supply , as >>long as you dont just wave some canned design over it like a dead chicken. >>
Controlling rolloff and ringing over a wide range of conditions is easier >>with a bit of theoryyou can estimate the overshoot via the Q of the >>network, for instance.
Canned designs such as Butterworth, Chebyshev, and so on assume constant, >>resistive source and load. While thats a useful fiction in lots of >>signal-level applications, its not remotely true in a power supply.
Cheers
Phil Hobbs
My switching power supply filters are usually dominated by the first >inductor. It has to let some tolerable ripple current into the
downstream caps, has to not saturate, and must not get too hot in the
minimum expected air stream, from core loss and copper loss. And fit >available space and not cost too much and be available for purchase.
I'll often have a secondary high-current ferrite bead to reduce EMI
spikes, typically maybe a per cent of the main inductance.
None of that is classic filter theory.
Only Spice can predict the power supply load response. It's too
nonlinear for classic filter theory.
There are cheap tricks to compensate the control loop, once the big
power stuff is designed.
On Wed, 26 Jun 2024 20:07:12 -0700, john larkin <jl@650pot.com> wrote:
On Thu, 27 Jun 2024 02:49:37 -0000 (UTC), Phil Hobbs >><pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@650pot.com> wrote:
On Tue, 25 Jun 2024 17:43:56 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Tue, 25 Jun 2024 08:19:03 -0700, john larkin <jl@650pot.com> wrote: >>>>>
On Tue, 25 Jun 2024 11:50:05 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:
On 21/06/2024 14:05, john larkin wrote:I know a guy who built a HeNe. It wasn't hard.
There was a thread somewhere above about photon wave/particle duality. >>>>>>>>
This is worth reading:
< https://www.amazon.com/How-Laser-Happened-Adventures-Scientist/dp/0195153766 >
Einstein, in one of his fits of genius, predicted in around 1916 that >>>>>>>> under the right conditions, a photon could pass by an excited atom and >>>>>>>> the atom would kick in another photon, or add to the wave amplitude, >>>>>>>> depending on how you feel about these things. He called it stimulated >>>>>>>> emission. He also declared that the laws of thermodynamics made this >>>>>>>> effect impossible to use in practical situations.
In 1951, Charles Townes invented a work-around trick and built the >>>>>>>> maser, a gaseous microwave oscillator. His superiors thought he was >>>>>>>> crazy to dispute Einstein and almost threw him out of grad school, but >>>>>>>> it worked.
More interesting still nature beat him to it.
The natural source W3(OH) dense molecular cloud which has hydroxyl >>>>>>> masers pumped by UV bright young stars embedded in it.
Very bright ultra narrow band point sources on a fuzzy nebulous object. >>>>>>>
< https://articles.adsabs.harvard.edu/pdf/1981MNRAS.194P..25S>
What's interesting is that any decent neon sign shop could have built >>>>>>>> a HeNe laser in 1920.
They would have needed to make the mirror just cavity right though. >>>>>>
A nitrogen gas UV pulsed laser is possible just by getting the pressure >>>>>>> right and creating the population inversion. Self starting - there was >>>>>>> a (dangerous) experiment in SciAm Amateur Scientist column to do it >>>>>>> sometime in the 1970's. June 1974 in fact - cover shows the BZ reaction.
< https://www.scientificamerican.com/article/the-amateur-scientist-1974-06/>
The failure to discover fullerenes in soot was a lot more surprising >>>>>>> since they were there all the time since the invention of fire just >>>>>>> waiting to be extracted by benzene. For a long time space dust had a >>>>>>> spectrum that could not be reproduced on Earth by any known compound. >>>>>>>
Much like Helium was in the sun but more pervasive.
Too many powerful old farts declare things to be impossible.
.<https://en.wikipedia.org/wiki/Planck%27s_principle>
This is often paraphrased as "Science progresses one funeral at a
time".
Joe Gwinn
I see the same thing in electronic design. People favor accepted
practice, validated in textbooks, and apply all their intelligence to
showing how new ideas won't work.
A recent case is deciding that the LC's at the output of a switching
power supply are "a filter" so must follow classical filter theory,
pole-zeros and Butterworths and such. I tell them "It's just a power
supply."
Classical filter theory is very useful for designing a power supply , as >>>long as you dont just wave some canned design over it like a dead chicken. >>>
Controlling rolloff and ringing over a wide range of conditions is easier >>>with a bit of theoryyou can estimate the overshoot via the Q of the >>>network, for instance.
Canned designs such as Butterworth, Chebyshev, and so on assume constant, >>>resistive source and load. While thats a useful fiction in lots of >>>signal-level applications, its not remotely true in a power supply.
Cheers
Phil Hobbs
My switching power supply filters are usually dominated by the first >>inductor. It has to let some tolerable ripple current into the
downstream caps, has to not saturate, and must not get too hot in the >>minimum expected air stream, from core loss and copper loss. And fit >>available space and not cost too much and be available for purchase.
I'll often have a secondary high-current ferrite bead to reduce EMI
spikes, typically maybe a per cent of the main inductance.
None of that is classic filter theory.
Only Spice can predict the power supply load response. It's too
nonlinear for classic filter theory.
Yes, this is exactly how all the radar power engineers of my
acquaintance solve the problem. LT Spice is their standard tool.
There are cheap tricks to compensate the control loop, once the big
power stuff is designed.
Yep.
Joe Gwinn
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