[Follow up from alog45846] After waiting for thermal related things stabilize overnight, I went out and took another measurement of CLF launch and SHG GR (first diode looking at green from the SHG). CLF is now much better intensity noise wise. Not sure why CLF RIN wouldn't just fall on Mephisto level (IR DCPD) at <1kHz. SHG_GR_DCPD however, isn't doing so well. Note that data from Dec 6 were from the before PBS cube was installed.

On Wednesday Daniel closed the AOM loop (alog45883) and here's pump intensity from SHG launch before and after. Much improved.

Sadly, TTFSS fastmon doesn't seem to improve. These were in-loop measurement (same loop configuration).

Intensity loop has a UGF at ~15kHz.

And here's how we lock it (more details on alog45883). Guardian for this is not in yet.

LO IMON looks a bit better (locked with PSL LO), but not significantly better. The rms is probably dominated by peaky features that didn't exist on October 12 (alog44575). Turning the half waveplate on CLF path helps with the peaks. One thing to test is to shoot in max CLF power and see if the features disappear.

Note to self, more to do:

- LO IMON compare between before and after PBS was installed

- Look at PSL ref cav trans noise

- Project SHG launch intensity noise and see if it compares with the measured IMON. This should tell us whether or not the access noise comes from intensity noise. 

- Compare OPO length noise then and now

- see squeeze with PSL LO to see if we have the same noise that we saw in DARM <-- Will probably do that one first.