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Entry   SBOX mirrors cleaned, posted by Loïc Amoudry at Optical room about lasers and optics 
    Reply   SBOX mirrors cleaned, posted by Loïc Amoudry at Optical room about lasers and optics 
       Reply   SBOX mirrors cleaned, posted by Loïc Amoudry at Optical room about lasers and optics 
Message ID: 54     Entry time: Wed Feb 5 14:47:16 2020     In reply to: 53     Reply to this: 55
 Author: Loïc Amoudry 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: SBOX mirrors cleaned 

Yesterday, after installation and alignment of mirrors and cavity, the Finesse has been measured with cavity at air pressure, with Koheras and modulation technique.
the measurement has been done 7 times with quite different fits for the Finesse : 21.5k, 21.5k, 23.7k, 21.3k, 22.3k, 22k, 21.5k

But, as the cavity is at air pressure, the lock is not very stable.
we will pump the cavity and make the measurement again.

 

Loïc Amoudry wrote:

Today, SBOX mirrors have been cleaned with spin coater on HR face and isoprop on back face. They show similar spots as before.

They also have been installed in the SBOX. The M1 mount has been displaced so the beam doesn't go in its center (spot).

 

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