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Reports until 18:21, Friday 02 October 2026
H1 CAL (CAL)
anthony.sanchez@LIGO.ORG - posted 18:21, Friday 02 October 2026 (92175)
New PCAL Laser beam profile

I've been in and out of the PCAL lab trying to test this new laser from CrystaLaser this week.
Thankfully I was able to connect with Dr. Jin out there and they steered me in the right direction.

When I first tried to test it I had the wrong power supply that couldn't keep up with current demands. As noted by the faintly lit current limit LED. The laser needs around 1.3 to 1.5 Amps to start up.

I've been finding that I had a fairly consistant TEM01 mode coming out of the laser it's self. I'm certain that the laser's been jostled around during shipping. After a few emails with Dr. Jin about this, Jin was able to guide me towards easily tweaking the laser to get a much better beam out of this laser head.

I was able to set up a beam profiler to do some preliminary beam profile data from a scanning slit profiler that was getting 1% of the beam out of a 1% beam splitter. 
the other 99% was sent to a power meter. 

Subject laser:
Make: CrystaLaser. 
Model: CL1047-2W0-ULG
Serial number: SN 460308-9464 
Gov #: G33348
Max power: 1.92W (measured after a 1% beam spliter.)
More beam profiler info comming soon. 
  

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