Sheila, Ryan S, Camilla,
Our SQZ power measurements we've taken so far seem to be unreliable: 91360, 91197. So we made a crane to hold the power meter steady on the OPOS by temporarily removing the OPO SUS EQ stop, see photo of crane before power meter was added. In brackets is the order the measurements were taken.
We seem to get loss both at SFI1 and B:L1 aperture.
- (1) Out of OPO before A:DC1: 1.30mW
- 2% loss through SFI1 first pass, expect 1%
- (4) After ZM1 1.275mW
- 2% loss through SFI1 second pass, expect 1%
- (2)After SFI1 before B:M1: 1.25mW
- 0.8% loss through B:L1 aperture, expect 0%
- (3) After B:L1 1.24mW
- 2.5% loss through SFI1 and B:BS1, expect 2%
- (5) After ZM4 1.21mW
- Total from OPO to after ZM4 6.9%, expect 4%.
The power then jumped and we took the following set of measurements, but they don't make as much sense so we think the power was drifting.
- After SFI1, before A:L2 1.34mW
- After A:L2 about 1.34mW
- No loss at A:L2 aperture.
- Repeating out of OPO 1.4mW
- 4.5% loss though SFI1 first pass the second time, seems too high.
- Repeating after ZM4 1.278mW
- Total 8.7% loss, expect 4%
Yesterday when Ryan and I set up the crane, we measured out of the OPO (1.37mW) and on the SQZT7 HD path after the lens (1.26mW) which is an 8% loss, consistent with today's first measurement.
*Total loss calculated as [1 - (Power after / Power before)]
