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One of my switchable gain Si detectors appears to have particularly bad noise perfomance.
I compared the dark Voltage noise of my Thorlabs PDs. I am barely below the ADC noise on one of my PDs, and it onlyu gets worse at lower frequencies, so for Beta, on my current setup, the PD noise is limiting me below about 5 Hz.
| Detector |
Noise (V/rtHz) @ 10 Hz |
Gain Setting |
| Alpha(532) |
600 n |
47500 V/A |
| Beta(532) |
4 u |
47500 V/A |
| Gamma(1064) |
40 n |
4750 V/A |
| Delta(1064) |
200 n |
4750 V/A |
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