The main laser can be attenuated with a waveplate just after the RP attenuator. To adjust the angle go to FACETHOME→Laser→LI20→Infrastructure→XPS moc-la20-ls24, channel 1.
Minimum energy corresponds to a waveplate angle of 74deg, maximum energy to an angle of 119deg.
The output energy of the attenuator as a function of waveplate angle was measured on 6/22/2022 as:
Transmitted Energy (Relative to max) | Waveplate Angle | Notes |
|---|---|---|
1% | 76.4 | |
| 1.4% | 76.9 | Equivalent to RP attenuator |
| 5% | 79.9 | |
| 10% | 82.6 | |
| 20% | 86.6 | |
| 30% | 90 | |
| 40% | 93 | |
| 50% | 95.5 | |
| 60% | 98.5 | |
| 70% | 101.5 | |
| 80% | 105 | |
| 90% | 109 | |
| 100% | 118.39 |