From: sam@repairfaq.org   
      
   To the first order, I come up with the Doppler-broadened portion being   
   proportional to optical frequency and then there is a constant portion   
   due to the natural line-width (~100 MHz).  So,   
      
     1.6 GHz at 633 nm (given)   
     380 MHz at 3,391 nm   
     1.84 GHz at 544 nm   
      
   Anyone know?  Where's Prof. Siegman when you need him? :)   
      
   Thanks!   
      
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