From: mscir@yahoo.com   
      
   On 10/9/2015 6:28 AM, ggherold@gmail.com wrote:   
   > On Friday, October 9, 2015 at 3:17:33 AM UTC-4, Mike S wrote:   
   >> On 8/21/2015 3:50 PM, RichD wrote:   
   >>> Lasers are useful for their low dispersion.   
   >>>   
   >>> What I wonder is, why are they necessary for the   
   >>> most common applications?  e.g. bar codes, CD readers,   
   >>> etc.   
   >>>   
   >>> My point is that collimated, non-coherent light   
   >>> was developed long before the laser.  So what makes   
   >>> a laser superior?   
   >>>   
   >>> --   
   >>> Rich   
   >>   
   >> Knowing nothing about lasers I found this discussion interesting. On   
   >> what may be a related note, does anyone know anything about the lasers   
   >> used in the devices they try to find gravity waves with?   
   >   
   > Well only from light reading.  Ligo (which is what I think you are talking   
   about.)   
   > is now moving to advanced ligo. https://www.advancedligo.mit.edu/   
   > (read away...)   
   >   
   > It's a huge project, maybe a thousand scientists.   
   >   
   > George H.   
      
   Thanks George.   
   Mike   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)