Mon Oct 7 14:51:53 2019. I closed the PSL shutter to measure the WFS head responsivity.
I made a thru calibration as in this elog, treating laser, reference PD, and WFS RF output as a three-port device. The DC current supplied to the laser is 20.0 mA in all cases. The Agilent spectrum analyzer supplies a -10 dBm excitation to Jenne laser's AM port, and A/B is measured with 20dB attenuation on each input port. Results are in /users/aaron/WFS/data/191007/. The calibration had 100 averages, all other measurements 32 averages; other parameters found in the yml file, same folder as the data.
| Measurement |
Reference PD DC (V) |
WFS Segment DC (V) |
WFS Segment DC, beam blocked (V) |
File |
Notes |
| WFS 1 Segment 1 |
1.86 |
0.79 |
-0.23 |
TFAG4395A_07-10-2019_154446.txt
|
|
| WFS 1 Segment 2 |
1.86 |
0.72 |
-0.30 |
TFAG4395A_07-10-2019_155017.txt |
|
| WFS 1 Segment 3 |
1.86 |
0.79 |
-0.21 |
TFAG4395A_07-10-2019_155645.txt
|
|
| WFS 1 Segment 4 |
1.86 |
0.70 |
-0.30 |
TFAG4395A_07-10-2019_160334.txt
TFAG4395A_07-10-2019_160847.txt
|
I noticed the BS-PRM illuminator was on, and turned it off for the second measurement |
| WFS 2 Segment 1 |
1.86 |
0.56 |
-0.38 |
TFAG4395A_07-10-2019_162533.txt |
|
| WFS 2 Segment 2 |
1.86 |
0.71 |
-0.21 |
TFAG4395A_07-10-2019_163402.txt
|
|
| WFS 2 Segment 3 |
1.86 |
0.68 |
-0.28 |
TFAG4395A_07-10-2019_164152.txt |
|
| WFS 2 Segment 4 |
1.86 |
0.57 |
-0.42 |
TFAG4395A_07-10-2019_164745.txt |
|
I normalized the result by the difference between the dark and bright DC levels of each segment.
Mon Oct 7 17:29:58 2019 opened PSL shutter. |