- At the end of the session, Jenne told me that the POP PD still has a large diameter beam. (and a steering mirror with a peculiar reflection angle.)
==> THIS SHOULD BE FIXED ASAP because the normalization factor can be too much susceptible to the misalignment of the spot.
Koji set the IFO in a PRM-ITMY configuration for me, while I went to put a lens on the POP path. Before putting the lens, the maximum average output that I saw from the diode (on a 'scope) was 4.40mV. After putting in the lens and realigning the beam onto the diode, the new max DCvalue that I saw was 21.6mV. This is a factor of 4.9.
EDIT: The dark value was -3.20mV, so actually the ratio is ~3.25 .
I have not yet done anything to fix the situation of the large angle of incidence on the first out-of-vac steering mirror.