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  • Acoustic Control Of Laser Light

    From Fred Bloggs@21:1/5 to All on Mon Oct 9 07:52:17 2023
    'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary
    research team in the journal Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html

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  • From John Larkin@21:1/5 to bloggs.fredbloggs.fred@gmail.com on Mon Oct 9 08:11:32 2023
    On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> wrote:

    'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary
    research team in the journal Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html

    What does

    "a strong infrared laser pulse could be redirected in this way with an efficiency of 50 percent"

    mean? Did they lose half the laser power?

    More press-release science. You could post those all day.

    What's your current elecronics project?

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  • From Fred Bloggs@21:1/5 to John Larkin on Mon Oct 9 08:44:32 2023
    On Monday, October 9, 2023 at 11:11:48 AM UTC-4, John Larkin wrote:
    On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs <bloggs.fred...@gmail.com> wrote:

    'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary
    research team in the journal Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html
    What does

    "a strong infrared laser pulse could be redirected in this way with an efficiency of 50 percent"

    mean? Did they lose half the laser power?

    More press-release science. You could post those all day.

    'Diffraction efficiency is the performance of diffractive optical elements – especially diffraction gratings – in terms of power throughput. It's a measure of how much optical power is diffracted into a designated direction compared to the power
    incident onto the diffractive element of grating.'

    https://en.wikipedia.org/wiki/Diffraction_efficiency

    That should have been obvious.



    What's your current elecronics project?

    project

    'an individual or collaborative enterprise that is carefully planned to achieve a particular aim.'

    huh?

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  • From a a@21:1/5 to Fred Bloggs on Mon Oct 9 20:26:27 2023
    XPost: free.spam

    The idiot Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> persisting in being an Off-topic troll...

    --
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    Message-ID: <1b700fde-dd1b-4165-8233-5d383a479c28n@googlegroups.com>
    Subject: Acoustic Control Of Laser Light
    From: Fred Bloggs <bloggs.fredbloggs.fred@gmail.com>
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  • From a a@21:1/5 to Fred Bloggs on Mon Oct 9 20:26:33 2023
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    The arsehole Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
    From: Fred Bloggs <bloggs.fredbloggs.fred@gmail.com>
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  • From a a@21:1/5 to John Larkin on Mon Oct 9 20:27:10 2023
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    The arsehole John Larkin <jl@997PotHill.com> persisting in being an Off-topic troll...

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    Subject: Re: Acoustic Control Of Laser Light
    Date: Mon, 09 Oct 2023 08:11:32 -0700
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  • From Phil Hobbs@21:1/5 to John Larkin on Mon Oct 9 20:28:52 2023
    John Larkin <jl@997PotHill.com> wrote:
    On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> wrote:

    'Using a novel method, beams of laser light can be deflected using air
    alone. An invisible grating made only of air is not only immune to
    damage from the laser light, but it also preserves the original quality
    of the beam, reports an interdisciplinary research team in the journal
    Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html

    What does

    "a strong infrared laser pulse could be redirected in this way with an efficiency of 50 percent"

    mean? Did they lose half the laser power?

    High frequency sound waves (above about 1 MHz) die off very fast in air.
    They also cause only a very small index modulation, so getting decent diffraction efficiency requires a long interaction region.

    So the diffraction angle will be small.

    Otherwise it’s a bog-standard acousto-optic
    modulator.

    Cheers

    Phil Hobbs
    --
    Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

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  • From whit3rd@21:1/5 to Phil Hobbs on Mon Oct 9 17:39:08 2023
    On Monday, October 9, 2023 at 1:29:00 PM UTC-7, Phil Hobbs wrote:
    John Larkin <j...@997PotHill.com> wrote:
    On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs <bloggs.fred...@gmail.com> wrote:

    'Using a novel method, beams of laser light can be deflected using air
    alone. An invisible grating made only of air is not only immune to
    damage from the laser light, but it also preserves the original quality >> of the beam, reports an interdisciplinary research team in the journal
    Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html

    High frequency sound waves (above about 1 MHz) die off very fast in air. They also cause only a very small index modulation, so getting decent diffraction efficiency requires a long interaction region.

    So the diffraction angle will be small.

    Otherwise it’s a bog-standard acousto-optic
    modulator.

    Except, it will respond to air qualities.
    Any pressure or composition changes will alter the acoustic wavelength and
    the deflection amplitude(s).

    One might use the effect to gain-switch a laser cavity?

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  • From Phil Allison@21:1/5 to All on Mon Oct 9 19:46:50 2023
    whit3rd wrote:
    -----------------------

    Otherwise it’s a bog-standard acousto-optic
    modulator.

    Except, it will respond to air qualities.
    Any pressure or composition changes will alter the acoustic wavelength and the deflection amplitude(s).


    ** The speed of sound does not depend on air *pressure* but rather on it's temperature.
    It follows very closely the sq.rt of the absolute temp value.
    Wavelength follows the inverse rule.

    Of course, a sudden pressure rise induces a temp rise causing very high SPL waves to become non linear.


    ....... Phil

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  • From a a@21:1/5 to whit3rd@gmail.com on Tue Oct 10 02:53:34 2023
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    The idiot whit3rd <whit3rd@gmail.com> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
    From: whit3rd <whit3rd@gmail.com>
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  • From a a@21:1/5 to Phil Allison on Tue Oct 10 02:53:40 2023
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    The idiot Phil Allison <pallison49@gmail.com> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
    From: Phil Allison <pallison49@gmail.com>
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  • From a a@21:1/5 to Phil Hobbs on Tue Oct 10 02:54:04 2023
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    The arsehole Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
    Date: Mon, 9 Oct 2023 20:28:52 -0000 (UTC)
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  • From whit3rd@21:1/5 to Phil Allison on Mon Oct 9 20:40:19 2023
    On Monday, October 9, 2023 at 7:46:55 PM UTC-7, Phil Allison wrote:
    whit3rd wrote:
    -----------------------

    Otherwise it’s a bog-standard acousto-optic
    modulator.

    Except, it will respond to air qualities.
    Any pressure or composition changes will alter the acoustic wavelength and the deflection amplitude(s).

    ** The speed of sound does not depend on air *pressure* but rather on it's temperature.
    It follows very closely the sq.rt of the absolute temp value.
    Wavelength follows the inverse rule.

    But the refractive index depends on air pressure (density of the gas).
    One presumes the diffraction is off the refraction modulation.

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  • From a a@21:1/5 to whit3rd@gmail.com on Tue Oct 10 04:24:19 2023
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    The arsehole whit3rd <whit3rd@gmail.com> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
    From: whit3rd <whit3rd@gmail.com>
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  • From Phil Allison@21:1/5 to Phil Hobbs on Tue Oct 10 00:22:44 2023
    Phil Hobbs wrote:
    ================


    'Using a novel method, beams of laser light can be deflected using air
    alone. An invisible grating made only of air is not only immune to
    damage from the laser light, but it also preserves the original quality >> of the beam, reports an interdisciplinary research team in the journal
    Nature Photonics. The researchers have applied for a patent for their method.'

    https://phys.org/news/2023-10-air-deflect-lasers.html

    What does

    "a strong infrared laser pulse could be redirected in this way with an efficiency of 50 percent"

    mean? Did they lose half the laser power?

    High frequency sound waves (above about 1 MHz) die off very fast in air. They also cause only a very small index modulation, so getting decent diffraction efficiency requires a long interaction region.

    So the diffraction angle will be small.

    Otherwise it’s a bog-standard acousto-optic
    modulator.


    ** See the authors original paper:

    https://www.nature.com/articles/s41566-023-01304-y


    ...... Phil

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  • From a a@21:1/5 to Phil Allison on Tue Oct 10 18:22:46 2023
    XPost: free.spam

    The arsehole Phil Allison <pallison49@gmail.com> persisting in being an Off-topic troll...

    --
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    Subject: Re: Acoustic Control Of Laser Light
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