This is a late alog about what was done on Friday last week.

At first the IR beam was clipping on the right  side of the first 1" mirror downstream of the periscope (ALS-M3 on D1201103). I moved it by about 6mm toward the PSL.

I aligned the IR beam going into the SHG by using ALS-M3 and ALS-M5 so the green beam falls on  ALS-COMM diode.

The beam was centered on IR monitor diode using ALS-M4.

The centering on the green monitor diode was OK, there was no big change (if any at all) when I changed the angle of ALS-BS2.

Laser power upstream of ALS-BS1 was about 200mW, and the green power downstream of the IRHR dichroic was about 220uW. Before laser swap, IR power was about 1.2W according to IR_DC_POWERMON, and the green power was about 8.3mW. It seems like the numbers make sense, i.e. 8.3mW * (200mW/1.2W)^2 = 8.3mw/36 = 230uW ~ 220uW.

I don't know if we're throttling power using HWP and polarizing splitter right after the PMC.