From: me@here.com   
      
   In article <4E430D38.1090106@electrooptical.net>, Phil Hobbs  wrote:   
   >Hi, all,   
   >   
   >I need some ND filters for a stabilized laser product I'm designing.   
   >Ideally it would be about 5 mm in size and less than 1 mm thick.   
   >   
   >The fallback position is to use a polarizer, which I can get in that   
   >size, but I'd far prefer to pick a density and stick to it.   
   >   
   >Oh, and it needs to be stable to ~10 ppm at 70 C over time scales of hours.   
   >   
   >Any bright ideas?   
   >   
   >Thanks   
   >   
   >Phil Hobbs   
   >   
   >   
      
   Might be a bit of a longshot, but I like longshots.. Take a look at motion   
   picture and stage lighting filter suppliers like Lee, Roscoe. They make   
   this stuff by the mile, in both flexible film and hard plastic/glass   
   substrates, and it's meant to stay very stable under pretty horrific   
   conditions. And for the sizes you're looking at, it should be dirt cheap,   
   and they might be willing to cut to size for a quantity purchase.. I'd   
   start with the color correction sets which usually have a big range of   
   ND filters for motion picture cameras. (versus the pure color filter   
   sets, I doubt you care if your filter is a Congo Blue..)   
      
      
   good luck!   
   D.   
      
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