From: luweitest@address.invalid   
      
   On 2016-2-23 9:46, RichD wrote:   
   > I atended a presentation of the LIGO discovery last week,   
   > by the lead engineer on the interferometry, the limiting   
   > factor on the whole shebang   
   >   
   > At conclusion, he forecast a schedule of long term performance   
   > improvements.  One of these, 10 years out, is the use of silicon,   
   > or silicon oxide, mirrors.   
   >   
   > What's the advantage of this material?  And what are they using now?   
   >   
   Maybe for the super flatness that can be achieved on silicon wafer? But   
   silicon wafer's reflectivity is not very high (~34%).   
      
      
   --   
   Regards,   
   Lu Wei   
   PGP key ID: 0x92CCE1EA   
      
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