jeffrey.bartlett@LIGO.ORG - posted 20:05, Friday 17 May 2019 - last comment - 22:50, Friday 17 May 2019(49325)
Squeezer Conversion Efficiency Low
The range has been a bit low since relock. Thought it might be due to high winds and series of EQs during the shift. In checking the Squeezer, found Squeezer SHG Conversion Efficiency Low status. Posted screen shots of the various related MEMD screens.
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Looks like the sqz laser has gone fully multi mode (again). The SHG green power is about 40% too low, which in turn reduces the non-linear gain in the OPO and changes the squeezer phase. I would expect squeezing injection to be somewhat ineffective in this state.
Agreed Daniel, this laser behavior is worse than ever. I set the half wave plate to roughly maximize the green into the fiber, which is about 20mW now, so the power into the OPO is similar to how it has been, just fluctuating a lot.