From: sam@repairfaq.org   
      
   Phil Hobbs  writes:   
      
   > On 10/18/2011 08:48 PM, Samuel M. Goldwasser wrote:   
   > > Phil Hobbs  writes:   
   > >   
   > >> On 10/17/2011 09:13 AM, Samuel M. Goldwasser wrote:   
   > >>> 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!   
   > >>>   
   > >>   
   > >> My reference books are at the lab, but that sounds about right.  The   
   > >> two widths add in RMS.   
   > >   
   > > Thanks!  So, by "add in RMS", you mean like uncorrelated noise sources?   
   > >   
   > > If we take the 100 MHz homogeneous line width and add it to the   
   > > ~300 MHz inhomogeneous linewidth, the result is about 316 MHz,   
   > > NOT 400 MHz?  Thus, my 380 MHz becomes 315 MHz.   
   >   
   > Yes, variances add under convolution.  (One of those nice Fourier   
   > transform theorems.)   
      
   Good! That number is much nicer. :)   
      
   Cheers!   
      
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