13a65e5a   
   From: bret.cannon@invalid.invalid   
      
   "alex"  wrote in message   
   news:30ed2499-1d2f-4ede-b9b7-163e3a13b1e5@x8g2000yql.googlegroups.com...   
      
   Just a quick check...  I am using an oriel Multispec (model 78854) and   
   a fibre attached to the input.  The spectrum of the (already filtered   
   light) has peaks of about 10nm.  It seems very wide, when I know that   
   the peaks are much narrower, because the light has been filtered with   
   a Fabry perot with a resolution of 1nm.   
      
   So what is wrong?  Do I need to match the NA of the fibre to the focal   
   length of the first mirror(concaved) to get better resolution.  Is   
   something likely to be misaligned?   
      
   When I move the fibre away from entrance slit a little the peaks   
   narrow abit...   
      
   I can find no manual or data about this model.  Although it seems to   
   be a czerny turner spectrometer.   
      
   Thanks   
   Alex   
   ALex   
      
   What is the core diameter of the fiber?  Does the fiber diameter act as the   
   entrance slit, so that the core diameter times the dispersion give a limit   
   on the resolution?   
      
   Bret Cannon   
      
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