Reports until 11:52, Tuesday 10 December 2013
H1 PSL
sheila.dwyer@LIGO.ORG - posted 11:52, Tuesday 10 December 2013 - last comment - 22:03, Tuesday 10 December 2013(8891)
ref cav realigned

power before AOM :31.1mW 

after single pass: 24.1mW 77% single pass effiicency

after double pass: 20.45mW  66% double pass efficiency

The beam position on the iris after the retro reflecting mirror has not changed. 

I tuned the upper periscope mirror pitch, this brought the transmitted PD voltage back to 1 V.  

We have 5.8 mW in the ALS path before the Faraday, 5.33 mW after the Faraday, 4.3mW going towards the fiber, and 1.04 mW going towards the fiber launch PD (external on the fiber dist box).  

Comments related to this report
alexan.staley@LIGO.ORG - 18:53, Tuesday 10 December 2013 (8899)
Link

In this configuration, I measured ~3.1mW at the input of the ALS fiber distribution and 100uW at the MSR.

sheila.dwyer@LIGO.ORG - 22:03, Tuesday 10 December 2013 (8902)ISC
Link

and the end station we see 40 uW coming out of the fiber, not really enough.