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Entry  Sun Jul 13 17:46:28 2014, Koji, Optics, Characterization, OMC backscatter measurement OMC_backscatter.pdf
    Reply  Tue Jul 15 03:00:42 2014, Koji, Optics, Characterization, OMC backscatter measurement 
       Reply  Tue Jul 15 03:34:16 2014, Koji, Optics, Characterization, OMC backscatter measurement OMC_backscatter.pdfOMC_backscatter.png
Message ID: 208     Entry time: Tue Jul 15 03:00:42 2014     In reply to: 207     Reply to this: 209  
Author: Koji 
Type: Optics 
Category: Characterization 
Subject: OMC backscatter measurement 

Presence of the misaligned SRM (T=20%) was forgotten in the previous entry.
This effectively reduces the OMC reflectivity by factor of 25.

This is now reflected in the original entry. Also the argument about the power spectram density was modified.

Quote:

First, I'm looking at the alog by Zach: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=8674

I'm not sure how this measurement can be converted into RIN. Well, let's try. Assuming his measurement is done with the single bounce beam from an ITM,
and assuming this plot is already normalized for RIN, we may need to multiply the number on the plot by factor of two or so. Then it's about factor of 5 lower RIN
than the expected RIN. And in terms of R, it is 25 times lower.

 

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