XPost: sci.physics, sci.physics.electromag   
   From: gah@ugcs.caltech.edu   
      
   In sci.physics.electromag Jos Bergervoet  wrote:   
      
   (snip)   
   > No, don't. The IR is not coming out so the exit pupil   
   > is irrelevant. IR-to-visible conversion would require   
   > the IR to be sensed by some image detector. And then   
   > there is *no* limit to how much a larger objective   
   > helps (because the sensor has no pupil).   
      
   I don't know that it is requried, but it is in all systems   
   that I know about.   
      
   Within the field of non-linear optics, there might be   
   some different kinds of conversions that could be done.   
   Those might convert infrared photons to visible photons   
   that are going in the same direction.   
      
   -- glen   
      
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