Terry and I quickly set up a 1811 on the CLF beam to check for seeding, and we see that our level of 3MHz sidebands on the CLF (which will be at the interferomter carrier frequency) is similar to what was seen at LLO 37945

Details:

We put the 1811 (AC coupled version) in place of the CLF rejected diode.  We used the half wave plate in front of the PBS to reduce the power here.  Once the diode was in we set the waveplate so that we saw 495 +/- 5mV of DC output (transimpedance 10V/mA) and measured the RF (+/- 1dBm for all):

-75dBm at 3.127 MHz
-75dBm at 200 MHz
-75.8 dBm 203.128 MHz  

Comparing this to LLO, we are getting 4 times more DC power, and about 6dBm more 3MHz signal, so that means that relative to the carrier our seeding power level is similar to LLO.  We haven't moved the RF amplifiers, feedthroughs, or attentuators as was done at LLO, which is consistent with the LLO results.  

While we were doing this measurement, I must have bumped the PBS in the CLF path which is very loose in it's mount, misalinging the fiber input  Terry tightened the mount, and we were able to find the beam in reflection off the OPO by carefully adjusting the PBS mount.  Then we used the two steering mirrors in front of the fiber coupler to maximize the transmission.  We found while doing this that the CLF launch diode was misaligned, and it looks like this has been misaligned for more than 20 days.  The beam is now aligned onto the diode.  Terry measured 4mW going towards the fiber, and the fiber launch diode reports 3.75mW towards the fiber.  The CLF Trigger diode reports 1 mW coming out of the chamber.