• Pockels cell vs. PEM

    From 50006564@twinriversusd.org@21:1/5 to Monica on Wed Mar 14 10:47:14 2018
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a photoelestic modulator? Thanks.

    Monica

    my name is also monica

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  • From Phil Hobbs@21:1/5 to 50006564@twinriversusd.org on Wed Mar 14 20:29:44 2018
    On 03/14/2018 01:47 PM, 50006564@twinriversusd.org wrote:
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a
    photoelestic modulator? Thanks.

    Monica

    my name is also monica

    Do you also have a Pockels cell and a photoelastic modulator?

    Cheers

    Phil Hobbs

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

    160 North State Road #203
    Briarcliff Manor NY 10510

    hobbs at electrooptical dot net
    http://electrooptical.net

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  • From ggherold@gmail.com@21:1/5 to Phil Hobbs on Thu Mar 15 06:18:08 2018
    On Wednesday, March 14, 2018 at 8:29:50 PM UTC-4, Phil Hobbs wrote:
    On 03/14/2018 01:47 PM, 50006564@twinriversusd.org wrote:
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a
    photoelestic modulator? Thanks.

    Monica

    my name is also monica

    Do you also have a Pockels cell and a photoelastic modulator?
    My name is not monica, and I never heard of a photoelastic
    modulator. :^)

    George H.

    Cheers

    Phil Hobbs

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

    160 North State Road #203
    Briarcliff Manor NY 10510

    hobbs at electrooptical dot net
    http://electrooptical.net

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  • From Phil Hobbs@21:1/5 to ggherold@gmail.com on Fri Mar 16 11:31:30 2018
    On 03/15/18 09:18, ggherold@gmail.com wrote:
    On Wednesday, March 14, 2018 at 8:29:50 PM UTC-4, Phil Hobbs wrote:
    On 03/14/2018 01:47 PM, 50006564@twinriversusd.org wrote:
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a >>>> photoelestic modulator? Thanks.

    Monica

    my name is also monica

    Do you also have a Pockels cell and a photoelastic modulator?
    My name is not monica, and I never heard of a photoelastic
    modulator. :^)

    George H.

    I'm relieved to hear that you aren't living a double life. ;)

    PEMs are sort of the low-frequency limit of an AO cell. They're excited
    at their lowest longitudinal resonance (like an organ pipe), and the
    resulting stress birefringence makes it into a wave plate, like a
    Pockels cell only much much slower. The good news is that the
    birefringence is much more uniform over their apertures--Pockels cells
    are the pits that way.

    PEMs are a good match for lock-in amplifiers in student labs--I'm mildly surprised that you folks don't sell them.

    It's irrational week--we had Pi Day, the Ides of March, and are now
    passing sqrt(10) on the way to St Patty's tomorrow. ;)

    Cheers

    Phil Hobbs


    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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  • From ggherold@gmail.com@21:1/5 to Phil Hobbs on Mon Mar 19 07:38:10 2018
    On Friday, March 16, 2018 at 11:31:37 AM UTC-4, Phil Hobbs wrote:
    On 03/15/18 09:18, ggherold@gmail.com wrote:
    On Wednesday, March 14, 2018 at 8:29:50 PM UTC-4, Phil Hobbs wrote:
    On 03/14/2018 01:47 PM, 50006564@twinriversusd.org wrote:
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a >>>> photoelestic modulator? Thanks.

    Monica

    my name is also monica

    Do you also have a Pockels cell and a photoelastic modulator?
    My name is not monica, and I never heard of a photoelastic
    modulator. :^)

    George H.

    I'm relieved to hear that you aren't living a double life. ;)

    PEMs are sort of the low-frequency limit of an AO cell. They're excited
    at their lowest longitudinal resonance (like an organ pipe), and the resulting stress birefringence makes it into a wave plate, like a
    Pockels cell only much much slower. The good news is that the
    birefringence is much more uniform over their apertures--Pockels cells
    are the pits that way.

    So the birefringence is modulated at the drive frequency?
    I think I've seen these at trade shows.

    PEMs are a good match for lock-in amplifiers in student labs--I'm mildly surprised that you folks don't sell them.

    It's irrational week--we had Pi Day, the Ides of March, and are now
    passing sqrt(10) on the way to St Patty's tomorrow. ;)

    Grin. After 70's F in LA, I'm back to drifts of snow at the bottom of
    my drive way. I am so ready for this winter to be over... though
    I did drag 'the boy' out back for some sledding. With 2' of snow still
    on the ground I figured we might as well use it for something.

    George

    Cheers

    Phil Hobbs


    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to ggherold@gmail.com on Tue Mar 20 12:25:41 2018
    On 03/19/2018 10:38 AM, ggherold@gmail.com wrote:
    On Friday, March 16, 2018 at 11:31:37 AM UTC-4, Phil Hobbs wrote:
    On 03/15/18 09:18, ggherold@gmail.com wrote:
    On Wednesday, March 14, 2018 at 8:29:50 PM UTC-4, Phil Hobbs wrote:
    On 03/14/2018 01:47 PM, 50006564@twinriversusd.org wrote:
    On Monday, March 10, 1997 at 12:00:00 AM UTC-8, Monica wrote:
    Hi all,

    Can anyone tell me the difference (if any) between a pockels cell and a >>>>>> photoelestic modulator? Thanks.

    Monica

    my name is also monica

    Do you also have a Pockels cell and a photoelastic modulator?
    My name is not monica, and I never heard of a photoelastic
    modulator. :^)

    George H.

    I'm relieved to hear that you aren't living a double life. ;)

    PEMs are sort of the low-frequency limit of an AO cell. They're excited
    at their lowest longitudinal resonance (like an organ pipe), and the
    resulting stress birefringence makes it into a wave plate, like a
    Pockels cell only much much slower. The good news is that the
    birefringence is much more uniform over their apertures--Pockels cells
    are the pits that way.

    So the birefringence is modulated at the drive frequency?
    I think I've seen these at trade shows.

    PEMs are a good match for lock-in amplifiers in student labs--I'm mildly
    surprised that you folks don't sell them.

    It's irrational week--we had Pi Day, the Ides of March, and are now
    passing sqrt(10) on the way to St Patty's tomorrow. ;)

    Grin. After 70's F in LA, I'm back to drifts of snow at the bottom of
    my drive way. I am so ready for this winter to be over... though
    I did drag 'the boy' out back for some sledding. With 2' of snow still
    on the ground I figured we might as well use it for something.

    Yeah, we're getting probably 8 inches tomorrow, but if the storm veers
    inland a little more, we could get a good foot. Then it might be a good
    thing I had that generator installed.

    Cheers

    Phil Hobbs

    [sqrt(10) day could also be called "10 dB day" for voltage fans.] ;)

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    https://hobbs-eo.com

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