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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: 38     Entry time: Tue Dec 17 10:56:08 2019     In reply to: 36
 Author: Ronic Chiche 
 Status: Fixed 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: first data with 3A on the 3rd stage 

2 pictures :

typical beam with HOM

typical beam after moving the D-shape motor : no more HOM

Ronic Chiche wrote:

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: HOM_5-3_saturated.png  554 kB  | Show | Hide all | Show all
Attachment 2: fundamental_mode_saturated.png  490 kB  | Hide | Hide all | Show all
fundamental_mode_saturated.png
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