[Marc, Mitsuhashi, Shalika]

We installed the surface reference sample and did several z scans to optimize the translation stage and imaging unit positions.

In the end we found the best calibration factor R = 14.37/W with z = 38mm and z_iu = 69.5 mm.

We installed the half inch sample with HR side facing the laser source and optimized the (x,y) position to maximize the transmission (x,y) = (327.4,121.8).

Finally, we measured absorption with 3 different inputs power and measured the HR surface absorption to be about 45 ppm.