On Sunday, August 10, 2014 8:32:42 PM UTC-4, Phil Hobbs wrote:   
   > On 8/10/2014 7:04 PM, ggherold@gmail.com wrote:   
   >    
      
   > >> Fabry-Perots are quite a bit harder to make than that.  What are you   
   > >> trying to do, exactly?   
   > >   
   > > Well, if you have a tunable laser, then some mirrors and lens tubes is   
   enough.   
   > At sufficiently low finesse, sure.  The problem is that the finesse is    
   > limited to about 1/(2*epsilon), where epsilon is the surface error in     
   > waves.  Your average lambda/10 surfaces will get you a maximum finesse    
   > of about 5.   
   >    
   Hi Phil,  I 'mostly harmless' when it comes to optics.  The link I posted was   
   for a confocal cavity.  (I don't know if that makes difference.) We get a   
   finesse a bit more than 100, mostly that seems to be dependent on how well you   
   set the mirror spacing..   
   . getting all those longitudinal modes to have the same wavelength.     
      
   George H.   
   >    
   > Cheers   
   >    
   >    
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   > Phil Hobbs   
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   > Dr Philip C D Hobbs   
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