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Entry   first data with 3A on the 3rd stage, posted by Ronic Chiche at Optical room about lasers and optics Screenshot_2019-12-13_3_184235.pngHOM.gif
    Reply   first data with 3A on the 3rd stage, posted by Ronic Chiche at Optical room about lasers and optics HOM_5-3_saturated.pngfundamental_mode_saturated.png
Message ID: 36     Entry time: Fri Dec 13 18:28:00 2019     Reply to this: 38
 Author: Ronic Chiche 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: first data with 3A on the 3rd stage 

Today, at 3A on the 3rd stage, we saw some HOM effects.
the transmissions is about 100mW which corresponds to 30kW inside cavity.
we tried to play with D shape motors but without success.

on the plot below, a mix between Thermal effects andHOM effects (the trans step at 13s is done without any external action)

-yellow : transmission
- orange : coupling
- blue : PZT correction

the camera video does not correspond exactly to the scope plot.
it is just an example of HOM effect.

Attachment 1: Screenshot_2019-12-13_3_184235.png  26 kB  | Hide | Hide all
Screenshot_2019-12-13_3_184235.png
Attachment 2: HOM.gif  359 kB  Uploaded Thu Dec 19 11:06:49 2019  | Hide | Hide all
HOM.gif
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