Attached is the parameters which is necessary for calibrating OpLev signals to angles or displacement of the mirror.
Incident angle and distance between sapphire mirror and viewports are the designed values.
The other parameters are measured values at IXC with rulers.

From the slope of graph of QPD counts vs QPD position, we can obtain following calibration factors.

PIT: 119.6 urad/cnt
YAW: 104.7 urad/cnt
LEN: 433.5 um/cnt

I implemented LEN calibration factor at K1:VIS-ITMX_TM_OPLEV_LEN_HOR_GAIN but didn't TILT calibration factors because TILT values are used for the reference of the mirror angle.