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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