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Entry   Alphanov amplifier power measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics power_after_compressor_vs_current_for_133MHz_laser.png
    Reply   Alphanov amplifier power measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics 
Message ID: 133     Entry time: Fri Mar 18 11:48:14 2022     Reply to this: 134
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: lasers and optics 
 Location: ThomX igloo 
 Title: Alphanov amplifier power measurement 

This morning, with Manar and Aurélien, we measure the power directly at the output of the Alphanov amplifier with the 2 compressors CVBG (seeding laser at Frep = 133MHz)
(we had to remove the base plate where the deflector mirrors were mounted to put the large powermeter).

with the previously described procedure, it seems that the Alphanov software is now working and we were able to start immediately the amplifier.

the chiller temperature was set at 25°C but we saw in the Alphanov documentation that the chiller temperature was closer to 20°C.
we did several measurements at 25°C and 20°C and it doesn't change a lot the output power.
so, we set the temperature to 23°C to avoid condensation (if too cold).
we will ask Guillaume what is the best temperature for the chiller.

power measurements:
power ratio     =>   measured output power (with external powermeter, not with the software)
10%               =>               1W
20%               =>               9W
30%               =>               17.6W
40%               =>               26.4W
50%               =>               34.5W
60%               =>               42.5W
70%               =>               49.3W
80%               =>               56.6W
90%               =>               63.6W
100%             =>               ~70W (expected value, not measured)

we stopped the measurements at 90% as we observed a difference in the software between the expected values (previously recorded by Alphanov) and the present ones.
the present values are quite bigger than the ones measured by Alphanov.
Aurélien will call Guillaume to check if it is a problem or not.

Attachment 1: power_after_compressor_vs_current_for_133MHz_laser.png  22 kB  Uploaded Thu Nov 3 15:46:58 2022  | Show | Show all
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