I've got a piece of BK7 with AR coating on both sides (spec'ed for visible   
   at 45 degrees, I think)  I'd like to have a piece with AR coating on only one   
   side.   
   Is there a (not too complicated) way to remove the coating?  Not a big deal if   
   not,   
   I can get "beam samplers" from Thor labs for ~$35-55.   
      
   George H.   
      
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