TJ, Camilla. WP #11483. Completed at EX last week: 73717 

Uninstalled the "new" S&K HWS laser (TSOP M1900163) from the ALS table with it's 50:50 fiber splitter, will store it in the LVEA TCS cabinets. Removed fiber, SM1FCA fiber launcher and LA1134-A F-60mm PLCX lens. This was installed in 2019 (52500, 52513, 52551).

Reinstalled the "old"  diode source M530F2 (eye safe). Using M92L02 200um multi-mode fiber and D1800125 fiber launcher with F=125mm BN7 lens. the remote on/off power supply wasn't working so we plugged this eye-safe laser directly into wall power, this means H1:TCS-HWS_ETMX_SLEDSHUTDOWN will not be reporting what the laser is doing. Struggled to get to postioning of 125mm lens to give us a good size beam into the periscope, beam remains too big. 

There was alot of clipping on this path so we removed the two 1" pico mirrors and replaced with 2" non-pico mirrors (M1 and M2 from D1400241), as we have done at EX table. M1A,B,C Dog leg was removed previously. Realigned the path but didn't find the retro-reflected beam off ETMY, ISI was down so we aligned as best we could into vacuum and left it. Temporarily added a mirror after the ALS beamsplitter (ALS-M11) to retroreflect the beam to the CCD camera and check how Gaussian it was (repeat of 63019 EX work) but the beam was much too big at the camera. Again showing our mode matching isn't correct. 

Photos before and after attached. Decision made to swap back to original source in T2300336. Will update FRS 14310 with Aidan.