This weekend we managed to get the majority of the phase camera setup installed onto ISCT1. We are aiming to image each sideband at the POP port to help diagnose what might be happening to all our RF sidebands at LHO.
The phase camera needs a reference light field to image each sideband. The phase camera we are installing is detailed in P1900013, we are compiling a technical note on the setup which I'll post when it's more complete. The reference field comes from a fiber from the ALS distribution box (sample port ~2.5mW) which couples light onto an optical breadboard next to ISCT1. This has two free space AOMs on it which are double passed and allow us to shift the reference field in frequency relative to the carrier. The shifted light is fiber coupled from the breadboard on to ISCT1 where we have aligned and mode-matched it to the beam at POP. Some of the combined light is sent to a photodiode and used to phase lock the beat with the electronics driving the phase camera. So far the phase locking is working and the phase camera is demodulating the beam. However, some of our electronics died just before the weekend and we weren't able to fix it, so we didn't manage to get an actual image yet. We've come up with a solution that we'll try tomorrow and hopefully start gettings images of the beams in PRMI/DRMI.
Cao and I are done for today
We are back in, we'll be around ISCT1 and the electronics room.
Forgot to post when we left.
This weekend we managed to get the majority of the phase camera setup installed onto ISCT1. We are aiming to image each sideband at the POP port to help diagnose what might be happening to all our RF sidebands at LHO.
The phase camera needs a reference light field to image each sideband. The phase camera we are installing is detailed in P1900013, we are compiling a technical note on the setup which I'll post when it's more complete. The reference field comes from a fiber from the ALS distribution box (sample port ~2.5mW) which couples light onto an optical breadboard next to ISCT1. This has two free space AOMs on it which are double passed and allow us to shift the reference field in frequency relative to the carrier. The shifted light is fiber coupled from the breadboard on to ISCT1 where we have aligned and mode-matched it to the beam at POP. Some of the combined light is sent to a photodiode and used to phase lock the beat with the electronics driving the phase camera. So far the phase locking is working and the phase camera is demodulating the beam. However, some of our electronics died just before the weekend and we weren't able to fix it, so we didn't manage to get an actual image yet. We've come up with a solution that we'll try tomorrow and hopefully start gettings images of the beams in PRMI/DRMI.