Naoki noticed the pump fiber rejected PD (in ham7, rejects pump fiber light that comes out in the wrong polarization) was saturated, so today I re-aligned the pump fiber polarization using sqzt0 pico's (described recently also in 71761).
I'm not sure why pump fiber needs to have its input polarization readjusted so often; I checked the CLF fiber and FCGS fiber, and they both seemed relatively well-aligned despite having not adjusted those in a while. Especially this time, it seems the fiber polarization got misaligned more quickly than before.
Austin had to reset the sqz pump ISS again on Sunday (72474), lowering the generated sqz level by lowering OPO trans from 80uW (recent nominal) to 65uW. Sqz level correspondingly went down. Naoki and I have re-aligned the pump fiber polarization, and brought the squeezer back to the nominal 80uW generated sqz level.
It's strange that we had to re-align the pump fiber polarization, again. The pump fiber polarization seems to be misaligning more quickly recently, see trends. This time, the fiber polarization misaligned to saturation in 1-2 days (last time was several days, before that we never saw it misaligned to saturation). It also needed both the L/2 and L/4 waveplates to re-align it. We should definitely monitor this situation and see if we can understand/fix why it's happening.
