OK! I saw the optics are redundant and some of the components are not in a right place.
I will talk with you when you are back such that we can keep the usefulness of the setup.
These components are from when Rana and I used the StochMon PD to do the RFAM tuning, documented in elog 1926. This was a very handy measurement, but I'm not sure if whether or not we need it often enough to keep the optics there.