From: astroelectronic@t-online.de   
      
   Hello folks,   
      
   I have a laser vibrometer which has totally misaligned optics. It's a   
   Mach-Zehnder interferometer with a Bragg cell, as shown for example in figure   
   2 in this PDF:   
   http://www.polytec.com/fileadmin/user_uploads/Applications/Data_   
   torage/Documents/LM_TP_Idema_JP_2005_E.pdf   
   When no voltage is applied to the Bragg cell, the beam goes straight through.   
   When voltage is applied, then there is an additional beam at the exit which is   
   dimmer and a few degrees deflected.   
   My question: Which of the two beams must be aligned on the photodiodes?   
      
   Thanks,   
   Michael   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)