Today I repeated the characterization of an 'unknown sample' (a HWP) using motorized HWP and translation motor.

First, the calibration gave X_cal = 13.3 mm which is compatible with the previous estimation.

Then, I measured the unknown sample retardance to be 0.496 which is expected value.

Next step will be to be able to access photodiode signal on the PC to start the LabView automatization.