[Briana, Ian]

Polarized beamsplitters and fiber couplings are installed and placed generally on the board. Optics needing disassembly (see previous post) have been placed in their correct locations. Still need more BD.2 780 mirrors, which are certainly somewhere. The exact location remains a mystery.

The vapor cell was installed. First, four screws on the bottom of the GCH25-75 heater assembly were unscrewed to separate the structure into a top and bottom. Because the vapor cell is too small to fit in the radius of the heater assembly, adapter rings are enclosed around the vapor cell. The adapter rings were placed on the inner section of the heater assembly due to the length of the vapor cell. The nub on the side of the vapor cell is oriented towards the side to protect the cell. To mount the adapters around the vapor cell, the small screws on the very sides of the adapters were removed to split the adapters into two, after which they were placed over the vapor cell and rescrewed in. For a single adapter, the screws are antiparallel. The set screws on top of the adapters were screwed in last to ensure the vapor cell was fixed in the adapters. The vapor cell was then rotated so that the green part of the screw faced upwards (from the bottom part of the mount). Then, the top part of the mount was placed over the vapor cell such that the upwards-facing green part aligned with the holes for set screws in the top mount. Finally, the four screws were rescrewed in. 

Unfortunately, one of the four screws on the bottom of the vapor cell is now lost in the optical table abyss. The screw type is Black-Oxide Alloy Steel Socket Head Screw, 2-56 Thread Size, 1/4" Long | McMaster-Carr. A replacement was found and used instead.