Here's my first attempt at doing angular actuation calibration for IMC mirrors using the method descibed in /users/OLD/kakeru/oplev_calibration/oplev.pdf by Kakeru Takahashi. The key is to see how much is the cavity mode misaligned from the input mode of beam as the mirrors are moved along PIT or YAW.
There two possible kinds of mismatch:
Kakeru's document goes through cases for linear cavities. For IMC, the mode mismatches are bit different. Here's my take on them:
Calibration factor at DC [µrad/cts]