After Kevin did some 10kHz SQZ ADF scans, we look some SQZ FIS data. The best ASQZ and SQZ didn't look as good as usual, but we found our NLG was low. We didn't check the NLG first so that we had a direct comparison to Kevin's dataset.
Roughly following 83594 with slightly different data taken.
DTT saved as camilla.compton/Documents/sqz/templates/dtt/20250623_FIS.xml and screenshot attached.
| Type | Time (UTC) | Angle | DTT Ref |
| FIS Mean SQZ | 15:53:00 - 15:56:00 | N/A | ref 1 |
| FIS + Mid SQZ (aimed +7dB @1kHz) | 15:58:30 - 16:01:30 | (-) 242 | ref 2 |
| FIS - Mid SQZ (aimed +7dB @1kHz) | 16:03:00 - 16:06:00 | (-) 94 | ref 3 |
| FIS ASQZ | 16:08:30 - 16:11:30 | (-) 63 | ref 4 |
| FIS SQZ | 16:13:30 -16:16:30 | (-) 122 | ref 5 |
| No SQZ | 16:26:00 - 16:46:00 | N/A | ref 0 |
| OPO Setpoint | Amplified Max | Amplified Min | UnAmp | Dark | NLG | OPO Gain | Note |
| 95uW | 0.001504 | 6.71 e-5 | 0.0002828 | -2.52e-5 | 4.9 | -8 | Without changing OPO temp |
| 95uW | 0.002317 | 8.69e-5 | 0.0002828 | -2.52e-5 | 7.5 | -8 | With changing OPO temp |
Last week 85000, NLG was measured to be 18.9, now it's measured to be <8. We will look into why is it low.
Ran SCAN_SQZANG_FDS before doing a CO2 step.
I measured the NLG with a few different opo pump powers to follow up on Camilla's observation that the NLG was low.
| OPO trans power [uW] | maximum | minimum | nlg |
| 95 | 2.26e-3 | 8.195e-5 | 8.5 |
| 80 | 2.25e-3 | 8.795e-5 | 8.2 |
| 60 | 1.902e-3 | 8.866e-5 | 6.93 |
dark level 2e-5, unamplified 2.914e-4
I tried to lower the seed power to see if we have some pump depletion making us underestimate the NLG, but the half wave plate was already set to minimize the seed power.
Since the NLG looks to be about the same with 80 uW as 95uW, I set it to 80 uW for now.