Rick and I went down to End X to try and tune up the X End TX module. DCC T1600436-V12
We found the OFS offset to be set at 3.85V before we arrived.
A number of our measurements were made with the OFS Offset set to 7.7 V which is 100% of our useable OFS functionality. All of our low power measurments were done this way, and perhaps we should have dialed that back to 95% which may explain why some of our number look a little higher than last year's.
The Integrating sphere Apature target was put on the RX sensor.
The AOM position was adjusted, but resulted in no noticable difference in power.
The Beam spot on the TX PD was touched up, as it was not centered.
The Temperature and current for the Pumping Diode on the CrystaLaser Power supply was touched up to try and get some more performance out of it.
And the spot on the internal spectralon shell of the RX sensor was blown out with some compressed air. Spot is now gone.
| Date | April-22-2025 |
| Laser Shutter Check | Pass |
| Max OFS Offset | 7.7V |
| 95% OFS Offset | 7.315 |
| Operating OFS Offset | 3.6575 |
| Laser Output Power | 1.7 |
| After-Laser Rejected Power | 34.6mW |
| AOM Input Power | 1.65W |
| Max Diffracted Power | 1.14W |
| Un-Diffracted Power | 0.307W |
| AOM Diffraction Efficiency | 0.69 |
| After-AOM Rejected Power | 15.2mW |
| TxPD Power | 11.9mW |
| OFSPD Power | 5.7mW |
| Outer Beam Power | 0.536 |
| Inner Beam Power | 0.526 |
| Output Beam Power Ratio | 0.9813 |
| OFS Gain | 39.6 |
| OFS Phase Margin | 42.1 |
