[Lisa, Rana, Jenne]
Lisa asked to see a model of the PRMI sensing matrix with REFL165 included, in the hopes that it wouldn't be as degenerate as REFL33.
The conclusion, immediately after looking at this, is that I should make sure the REFL beam is nicely aligned onto the REFL165 PD (Koji did some tests, swapping out the REFL165 resonant PD with a broadband PD, and I don't remember if he aligned beam back onto the REFL165 PD). Then, I need to measure the PRMI sensing matrix, including REFL165. Hopefully, it is similar to the model, and we can use it as our 3f diode for locking.