From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 01/25/2016 12:36 PM, ggherold@gmail.com wrote:   
   > On Monday, January 25, 2016 at 12:26:36 PM UTC-5, Michael Koch wrote:   
   >> P.S. I'm not sure if it's a Bragg cell. It could also be an acousto-optic   
   modulator.   
   >   
   > Grin.. I think a Bragg cell is an AOM.  I'm pretty sure it's the deflected   
   beam   
   > that is modulated... But I only have experience with AOM's from the distant   
   past.   
   >   
   > George H.   
   >   
      
   The diffracted beam is frequency-shifted by the acoustic frequency,   
   which makes the interference AC.  That lets you tell the direction of   
   motion, and avoids having to surf fringes.   
      
   Cheers   
      
   Phil Hobbs   
      
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