Scanned the surf ref sample with the HeNe probe - Fig 1
R=AC/DC/P/Abs= 0.54/4.7/0.034/0.2 = 16.9W-1
Scanned the surf ref sample with the 1310nm probe - Fig 2
R=AC/DC/P/Abs= 0.086/1.98/0.034/0.2 = 6.4W-1
When changing the samples we wanted to have about the same DC signal on the PD so we changed the current of the 1310nm laser source.
1310nm parameters:
laser source current 0.7A -> PD DC: 2V (ref sample)
laser source current 1.97A -> PD DC: 2V (cryst coating sample)
Scanned the crystalline coating sample with the 1310nm probe - Fig 3
Abs = AC/DC/P/R = 0.0018/1.9/10/6.4 = 14.8ppm
Map 4mm diameter - Fig 4
Calibrated Map and histogram - Fig 5