NaokiAritomi - 21:50, Tuesday 30 July 2019 (1532)
Loss between OPO and homodyne
[Aritomi, Yuhang]
We measured loss of each optics between OPO and homodyne BS. We put BAB on resonance of OPO by hand and measured power. The result is as follows.
| position | power (uW) |
| after OPO | 231 |
| after dichroic mirror | 222 |
| after 100mm lens | 220 |
| after PBS | 219 |
| after 3 mirrors | 219 |
| after 150mm lens | 216 |
| after HWP | 215 |
| before homodyne BS | 215 |
Loss between OPO and homodyne is 7%. 4% is from dichroic mirror and 3% is from two lenses. According to spec of dichroic mirror (HBSY11), reflectivity for s pol should be 99.3%. We can try to optimize the angle or try another HBSY11. Anyway we need low loss dichroic mirror and superpolished lenses.
According to spec of dichroic mirror (HBSY11), reflectivity for s pol should be 99.3%. We need low loss dichroic mirror and superpolished lenses.
Images attached to this report
