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Entry   Transmission of the mirrors, posted by Loïc Amoudry at Optical room about lasers and optics 
    Reply   Transmission of the mirrors, posted by Loïc Amoudry at Optical room about lasers and optics 
       Reply   Transmission of the mirrors, posted by Loïc Amoudry at Optical room about lasers and optics 
Message ID: 28     Entry time: Thu Apr 4 09:42:12 2019     In reply to: 26     Reply to this: 29
 Author: Loïc Amoudry 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: Transmission of the mirrors 

After verification, transmission of P1 correspond to ~150ppm.

The 1337ppm come from a beam leakage. Reflection from P1 goes to the input window which reflects again a part of the beam directly into the cavity between P1 and S3 then between P4 and S2.

Loïc Amoudry wrote:

We openned the cavity, removed S2 and measured trans of P1 and same for S2.

Pin ~= 3.91 mW
PS2 ~= 20 nW --> ~~ 5 ppm !!!
PP1 ~= 5.23 uW --> ~~ 1337 ppm !?!?!

P1 is the Sapphire mirror. 3mm thick. Tomorrow we'll measure its trans again, being out of the mount for constraint issues.

 

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