Naoki Vicky Daniel
We physically placed the PMC, the RF photodetector, and a bunch of steering mirrors into the empty space on SQZT0. Everything seems to fit as planned. No beams yet!
We also installed the Thorlabs PDA100A that serves as the PMC_TRANS monitor. It is installed along the seed path. There is a 50:50 splitter that reduces the seed power by 2. We installed a one-side AR coated wedge in the path of the beam dump to get about 19mW of light that we steered onto the PDA100A.
The slow controls system was upgraded to add new channels associated with the PMC and update some channels names. There is no longer a FIBR_REJECTED PD, instead we added a FIBR_INPUT PD that monitors the fiber power from squeezer laser in the beat note box.We no longer have a monitor for light in the wrong polarization at the laser locking beat note. Instead, we have to use the beat note strength to optmize the input polarization.
Some photos here. Here is the PMC TRANS PD path and aligment, including the beam dumps. Here's a photo of PMC + RFPD fitting into the table, to-be aligned afterwards. The SHG beam path clears the back of the PMC, so that's good.
We also installed a longpass filter onto the SEED_LAUNCH_PD (FEL0850, cuts-on above 850nm), so we can now open the SQZT0 table lights without changing the measured seed launch power.
Updated medm