Pockels cell vs. PEM

[5***@twinriversusd.org]

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

[Phil Hobbs]

Post by 5***@twinriversusd.org

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

[g***@gmail.com]

Post by Phil Hobbs

Post by 5***@twinriversusd.org

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.

Post by Phil Hobbs
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

[Phil Hobbs]

Post by g***@gmail.com

Post by Phil Hobbs

Post by 5***@twinriversusd.org

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

[g***@gmail.com]

Post by Phil Hobbs

Post by g***@gmail.com

Post by Phil Hobbs

Post by 5***@twinriversusd.org

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.

Post by Phil Hobbs
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

Post by Phil Hobbs
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

[Phil Hobbs]

Post by g***@gmail.com

Post by Phil Hobbs

Post by g***@gmail.com

Post by Phil Hobbs

Post by 5***@twinriversusd.org

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.

Post by Phil Hobbs
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.] ;)