PeterK, RickS
Jason tweaked the alignment into the 70-W amp a bit late Friday afternoon. It seemed that the pedestal in the 70-W output beam had been reduced and the beam didn't look too bad.
Today, we aligned into the PMC, adjusted the modematching lenses, adjusted the 70-W diode temperatures, and adjusted the pump currents.
We now have about 60 W (59.9 W) in transmission with about 10 W (9.7 W) reflected from the PMC. This is about 86% visibility using the power monitors. The visibility measured with the DC out of the RFPD (using the no-light level when the PD is blocked, about 14 mV) is (238-26)/238 = 89% (see attached scope image). An improvement over what we had last week.
The ~60 W in transmission is close to what we need for O3.
The FSS is locked, but the ISS AOM is still removed from the beam path so the ISS is inoperable.
Forgot to mention that we cleaned a number of relay mirrors in the main path that had bright beam spots when inspected with an IR viewer. This needs some more attention and a few might need to be replaced.
Transmission and reflection photodiode outputs.
