From: rrllff@yahoo.com   
      
   On Tuesday, May 3, 2016 at 8:31:58 AM UTC-4, gghe...@gmail.com wrote:   
   >   
   > Thanks guys.  I don't want to polish!   
   > I want to pick off part of a laser beam.  But don't want two beams   
   > bouncing around.  (As I'd get from a thick piece of uncoated glass.)   
   >   
   > Would using a thin piece of glass be a bad idea?  I've got these   
   > microscope cover slips that we use as cheap windows.   
   > But I worry I'll get all sorts of weird interference effects.   
   >   
   > George H.   
      
   A thick piece of glass might be the best way.  It will spatially separate the   
   unwanted beam and you can then use a stop to block it.   
      
   Alternatively if your laser is polarized you may be able to make good use of   
   the Brewster angle.   
      
   http://www.richardfisher.com   
      
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