anthony.sanchez@LIGO.ORG - posted 16:16, Wednesday 28 January 2026 (88949)
PCAL TX Module Maintenance.
Yesterday Dripta & I went to the End X Station to do a TX module Maintenance.
The results of this TX Module Maint can be found here T1600436 :
| Laser SN01 | Incoming laser power from T1300100 | |||||||
| Date | 6/4/2013 | Aug. 3, 2018 | Mar. 19, 2019 | Jan-18-2024 | April-22-2025 | Jan-27-2026 | ||
| Laser Shutter Check | PASS | PASS | Pass | Pass | Pass | |||
| Max OFS Offset | 9.9 V | 7.8 V | 7.7V | 7.7V | 7.75 | |||
| 95% OFS Offset | 9.405 V | 7.4 V | 7.3V | 7.315 | 7.36 | |||
| Operating OFS Offset | 4.7025 V | 3.7 V | 3.85V | 3.6575 | 3.68 | |||
| Laser Output Power | 2.05 W | 1.72 W | 1.75 W | 1.67W | 1.7 | 1.662 | ||
| After-Laser Rejected Power | 56.5 mW | 54 mW | 36.6mW | 34.6mW | 35.7mW | |||
| AOM Input Power | 1.60 W | 1.69 W | 1.59W | 1.65 | 1.64 | |||
| Max Diffracted Power | 0.967 W | 1.13 W | 1.1W | 1.14 | 1.1 | |||
| Un-Diffracted Power | 0.359 W | 0.306 W | 266mW | 0.307W | 0.297 | |||
| AOM Diffraction Efficiency | 60.44% | 67% | 69.00% | 0.690909090909091 | 0.670731707317073 | |||
| After-AOM Rejected Power | 12.8 mW | 13.7 mW | 14.7mW | 15.2mW | 16.7mW | |||
| TxPD Power | 11.1 mW | 6.06 mW | 6.36mW | 11.9mW | 6.14mW | |||
| OFSPD Power | 5.7 mW | 6.56 mW | 6.36mW | 5.7mW | 6.58mW | |||
| Outer Beam Power | 228 mW | 0.257 W | 265mW | 0.536 | 512 | |||
| Inner Beam Power | 228 mW | 0.255 W | 260mW | 0.526 | 501 | |||
| Output Beam Power Ratio | 1 | 0.992217898832685 | 0.9811 | 0.98134328358209 | 0.978515625 | |||
| OFS Gain | 38.19 dB | 41 dB | 39.6db | 39.6 | 39.79 | |||
| OFS Phase Margin | 60.9 degrees | 55 degrees | 43deg | 42.1 | 42.3 | |||
| ALOG | 75484 | 88949 | ||||||
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