From: mikko.syrjalahti@nospam.fi   
      
   Hi,   
      
   We're using some 1.3-1.7um telco laser diodes for measurements and 5.6mm to-can   
   versions are becoming obsolete.   
      
   There are still suitable diodes with integrated fiber coupling lens,   
   which have focus at 7.5mm from the base. The coupled power may be   
   specified, but that's about it.   
      
   I'm a bit worried about stray light in the measurement and the focus   
   seems to have plenty of stray light when viewed with IR card.   
   I could put a pinhole at the focus, but that's again additional   
   mechanics and manufacturing steps.   
      
   Does anybody have experience in this kind of diodes and their focus   
   quality ?   
      
   --   
   mikko   
      
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