2ee4e963   
   From: siegman@stanford.edu   
      
   In article   
   <10343961-1082-45db-9a56-6366044f67bf@c13g2000vbr.googlegroups.com>,   
    dsb  wrote:   
      
   > Anyone have experience trying to mode match a laser into a confocal   
   > etalon?  I'm setting up a NICE-OHMS apparatus, and trying to inject   
   > light from a single mode, PM fiber coupled DFB laser (1530 nm) into a   
   > home built, 300 MHz FSR etalon.  The cavity Q is 600 and the laser   
   > linewidth is 500 MHz, implying an "exact" match between the cavity and   
   > laser bandwidths.  But, I can only get 20 to 25% of the light into the   
   > cavity.  I expect to do a factor of two better.  I've gotten some   
   > improvement by focusing the beam into the cavity, but that is what got   
   > me to the 20 to 25% point.  Changing the input beam diameter doesn't   
   > make any difference.  Any suggestions?   
      
   Is your objective to get 100% of the light **transmitted through** the   
   cavity at resonance? -- i.e., all input light emerges at the output end,   
   and there is no light reflected back at the input end?   
      
   Or is it to get all the light delivered into **and dissipated inside**   
   the cavity at resonance?   
      
   These need very different mirror reflectivities at the input and output   
   ends.   
      
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