From: boxman@voyager.net   
      
   On 7/30/2012 9:35 PM, Phil Hobbs wrote:   
   > boxman wrote:   
   >>   
   >> On 7/30/2012 11:11 AM, Michael Koch wrote:   
   >>> Hi,   
   >>>   
   >>> does anybody know a source for big 75mm beamsplitter cubes, broadband   
   400-700nm non-polarizing?   
   >>>   
   >>> Thanks,   
   >>> Michael   
   >>>   
   >>   
   >> I needed a 75 mm beamsplitter like this a few years ago and could not   
   >> find a supplier that stocked them.  I ended up buying the cheapest 75 mm   
   >> right angle prisms that met my optical specifications that I could find   
   >> and then working with a custom optical shop to have them coated and   
   >> assembled into a cube (I used PFG Precision optics for the coating and   
   >> assembly).   
   >   
   > 75 mm is a monster beam splitter.  Getting light through that much glass   
   > without serious waveform distortion can be a problem.  Do you really   
   > need it to be a cube?   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
   >   
   If a cube is used in a projection imaging system (which is what I was   
   using it for) then the cube works better than the plate because the   
   plate introduces a path difference in the combined beams for the   
   projection lens which can degrade the projected image worse than the cube.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)