Today I installed the SHINKOSHA evaluation plate #7 on the translation stage so that the top side of the ingot is facing the laser sources with marking on the right side of the sample looking from the laser source side.

I moved the IU to 62.6 mm to compensate for the thickness.

I checked the X and Y centering using drop of the DC values to ~ 8mV which gave : X_center = 397.466 mm and Y_center = 120.629 mm.

I increased the pump power to ~3W and checked the Z centering at that position from the phase = 0 deg and got Z_center = 53.2 mm.

I also checked the top/ bottom and left/right Z centering over a 120 mm diameter area and found a tilt of this sample in both these directions to be ~ 0.8 mm.

Matteo confirmed that it was small enough to start absorption measurement.

The XY absorption measurement started over a circular area with diameter 120 mm and step size 250 um with P_t = 3.198 W and P_in = 3.745 W