5660be33   
   XPost: sci.optics.fiber   
   From: MyNameForward@ReplaceWithMyVices.Com.invalid   
      
   In article <4E430D38.1090106@electrooptical.net>,   
    Phil Hobbs  wrote:   
      
   > 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.   
      
   I sure don't see any smaller than 12.5mm at the places I can think of to   
   look. sciplus has a 6mm red, but no detailed specs on it (but it's also   
   too thick at 1.4mm) and it's not neutral density....and I find UK and   
   German companies that claim to do custom filters.   
      
   > 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?   
      
   A 5mm i.d. tube, some carborundum, water, putty to make a ring dam, a   
   drill press, and a 2x2" or 1" round filter, depending what you can find   
   that you like?   
      
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