From: hitlong@yahoo.com   
      
   On Thursday, August 22, 2019 at 1:31:46 AM UTC-6, Tom Roberts wrote:   
   >   
   > On 8/20/19 2:59 PM, Douglas Eagleson wrote:   
   >   
   > > The laser has an outcome of a coherent beam.   
   >   
   > Hmmm. There are inherent limits to the coherence of a laser beam.   
   >   
   > > I believe these are termed the outcome of an oscillating system.   
   > > [...]   
   >   
   > I've never seen the term "oscillating system" used in this way. Lasers   
   > do not oscillate, they operate via stimulated emission between quantum   
   > energy levels.   
      
   I suppose the cavity can be called an oscillator, with the mirrors   
   provide a feedback mechanism.   
      
   Gary   
      
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