Reports until 10:28, Monday 12 November 2018
H1 AOS (SQZ)
terry.mcrae@LIGO.ORG - posted 10:28, Monday 12 November 2018 (45219)
update coupling to green light to fiber (now 85+/-1%)

The updated mode-matching solution to account for the noise eater alog(44783) assumed a waist at the coupler of 750um (because that was in the thorlabs documnentation recommended). However a measurement indicates a waist of 500um out of the coupler.

I adjusted the solution SHGtoFiberAM.pdf alog(44783) to move the  ROC75 lens 6cm closer to the SHG the ROC200 lens 1-2 cm further away from the SHG and the fiber coupler 10 cm further away from the SHG to get a waist of 550um.

To get a waist of 500um would take a relatively major path rearrangement and with the vent only hours away it was a little risky to do it now, I will fine tune after the vent and hopefully the proper solution will be significantly above 85%.