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Entry   M4 transmission measurement, posted by Loïc Amoudry at Optical room about lasers and optics 
    Reply   M4 transmission measurement, posted by Loïc Amoudry at Optical room about lasers and optics 
Message ID: 20     Entry time: Wed Oct 31 14:04:50 2018     In reply to: 19
 Author: Loïc Amoudry 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: M4 transmission measurement 
Loïc Amoudry wrote:

The kept transmission for M4 is 2.17 ppm. Which is the value measured after alignement (center of the mirror).

These measurements have been taken before alignement.

I (A) Input power (mW) Transmitted power after window (mW) Transmission (ppm)
0 74.3 195.2e-6 2.63
0 73.5 212.8e-6 2.89
0 52.4 151e-6 2.88
6 28 400 72e-3 2.54

High dependence against the position. Few measurement several mm away from the center each one at different position give 2.86, 2.68, 2.93, 3.01, 3.06, 3.35 ppm.

 

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