I would like to start on the 1550 path of OFC3. There are two ways to do this. We could just set up a test path directly from a fiber. With the intracavity alignment already done this seems like it is not worth the time. This just leaves aligning the light coming out of OFC2. The problem with this is as follows:
You can't PDH on 1550 in OFC2 as this was never set up. This means we have to lock on 775 and adjust the aom frequency so they are coresonant. This is bad for two reason: 1) the lock quality is very poor and 2) the two wavelengths are drifting relative to each other. You can fix this by adjusting the frequency of shift on the 775 path so that they are realigned, but continously doing so would be a pain. If you lock them while coresonant, and just watch the 1550 output over time it fluctuates wildly on a seconds time scale. I interpret this as the 1550 light drifting where it is along the lorentzian output peak. It does not seem feasible to try and align a cavity with this as your input light.

An alternate plan could be we fiber couple every cavity together. Use constant light from a real source to align and then just plug in your filter cavity output light fiber once its aligned. This introduced more loss into the GQuEST readout though. If anyone has ideas on this it would be appreciated.