Reflectivity of AR surface of LaserOptik (SN6)

The first step measurements of R for AR surface. I am not convinced with the data....because the power meter is a lame detector for this measurement.
I'm repeating the measurements again with PDs. But below is the log R plot for AR surface.
R percentage
6000ppm @ 42 deg
3560ppm @ 44 deg
7880ppm @ 46 deg
4690ppm @ 48 deg

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