From: naftalline@gmail.com   
      
   On Sunday, November 18, 2012 11:59:36 AM UTC-8, Naftalline wrote:   
   > Hi: 1-What causes polarization coating (the hypogenous interface) of a   
   Polarizing Beam Splitter Cube go bad and sometimes delaminated? I could think   
   of humidity+temperature. 2-Do you of any company and supplier who have   
   Polarizing Beam Splitter Cubes    
   without this problem? We'd like BPS Cube to have a "3 deg fielField of View"   
   and " Extinction Ratio >500". Operating Wavlength is ~900nm Your supplier   
   suggestions and comments are greatly appreciated.   
      
      
      
   Hi:   
      
   The Polarizing Beam Splitter Cubes we are using are N-BK7 and 12   
   7mmX12.7mmX12.7mm in size and are from CVI.  The operation wavelength is ~   
   900nm and its power is low (~ 50 uW).     
   When we look into the rejected PBS cubes (looking at the diagonal interface   
   where the polarization coating is) we see the polarizing coating is not   
   uniform, part of it appearing like an irregular stain (foggy looking), this   
   indicates that this    
   polarization coating might be going bad.  We don't what could cause this, our   
   geuss is humidity and temperature combination.   
      
   Our requirements are the size 12.7mmX12.7mmX12.7mm, ~3 deg Field of View, and   
   Extinction ratio > 500.   
      
   We appreciate if you know of suplliers that could provide these cubes, or have   
   ideas and suggestions   
      
   thanks   
      
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