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Entry   Alphanov amplifier beam profile measurement, posted by Ronic Chiche at ThomX igloo about lasers and optics 
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Message ID: 175     Entry time: Mon Jan 2 15:21:09 2023     Reply to this: 176
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: lasers and optics 
 Location: ThomX igloo 
 Title: Alphanov amplifier beam profile measurement 

today with Manar, we brought everything to make the profile measurement.

the chiller was in error because of the water level : we filled it in.
! warning ! there is no alarm signal, only a message on the screen.

we checked the incoming power measured by the software : 5.5 mW => OK
and we measured the output power (with pump) for :
0% => ~ 300 mW
10% => ~900 mW
20% => 8.65 W
30% => 17W

=> same as before.

the first HR mirror at the output of the amplifier was slightly scratched => we replaced it.

for sake of simplicity, we plan to use first a HR mirror and then 2x wedges for the profile measurement => to be checked next time.
we have to remove secundary beam reflections, then wedges are easier to use than AR/AR mirrors (as the 2 reflected beams are parallele).

at full power, the output power is ~ 70W
after 1st wedge : 2.8W
after 2nd wedge : 112 mW => the power should be low enough to use absorptive filters in front of the beam profiler.

 

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