Aidan, Dave H, Matt H, Greg G.

We aligned the X-arm CO2 laser through the first 40% of the optics on the table, including:

• M1: Beam is centered on this optic
• P1: The first polarizer dumps the majority of the s-polarization from the laser. With the laser running CW, 51.1W was transmitted, 121mW was reflected. 
• D1: Dumps the s-polarization from the laser
• AOM: We aligned the AOM by driving it with maximum RF input and rotating the unit until the transmitted beam was minimized on a viewing card. This yielded ~80% DE.
• DM1, D2: dumps 1st order beam from AOM.
• PO1: 99% reflector. Transmitted beam goes to ISS photodiodes
• IBS, IM2, IL1, IL2, IM1: All ISS optics aligned
• PD1, PD2: Not yet installed
• PM1, PM2: Beam steering picomotor mirrors - beam is centered on these optics
• L1: 6" focal length lens (part of telescope to image beam onto the masks)
• PO2: 99% reflector.
• QBS: 50/50 beam splitter for beam positioning
• QM1, LQPD: Lens and mirror aligned
• QPD1, QPD2: installed and beams roughly centered on these sensors. We've not confirmed the output from these yet.

We measured the DE of the AOM as a function of applied voltage (via the front end model). The results are posted in the table below. The AOM is quoted as having a maximum DE of ~85% at the exact Bragg angle.

The Y-arm table laser is ready to test on Wednesday.