J. Kissel

Quick summary of status and things done before the weekend:
    2026-05-14 
       - Secured new D2400143-v6 breadboard to 1"Dx6"L posts
       - w/ J. Freed Helicoiled most holes
  
    2026-05-15
       - Finished helicoiling and confirmed all holes have helicoils.
       - Brought out IXM100 mounts that are to replace CVM100 mounts, confirmed left vs. right-handed assignment
       - Fit-checked (success!), then installed new version of 45 deg periscope adapters to M_M4 and M_M5 mounts. 
       - Aligned periscope adapters as best possible by eye
       - Migrated over and re-cabled up all photodiodes per wiring diagram and cable routing defined in LHO:90228.
       - Migrated R_F1 and M_F1 fiber collimators, confirming and adjusting alignment of slow-axis w/ vertical flat.
       - Re-connected optical fiber input to each collimator.
       - Re-introduced beam on to breadboard confirming that NPRO and Laser Prep Chassis still work as good as we left it. 
       - Measured raw power from R_F1 and M_F1 fiber collimator output using S121C power meter.
       - Aligned R_F1 and M_F1 fiber collimator output using 
           - D2500080 alignment iris target assemblies
           - D2400143-v6 holes 89 + 101 for R_F1 and 101 + 80 for M_F1 and 
           - S121C behind the "far" iris, maximizing power throughput.
       - Migrated R_P1 and M_P1 thin-film polarizers.
       - Measured P-pol (TRANS) and S-pol (REFL). 
       - Migrated D_R_P1 and D_M_P1 beam dumps.

Optical power going into the mock PSL input fiber is ~195 [mW] as we left it, and internal laser prep chassis reads 7.8 [V] implying that input power to the chassis is the same 173 [mW] we set it to, to match the real PSL input (see LHO:89693).

RF power on power monitors from prep chassis are as expected, in the 750 +/- 10 [mV] range.

Measuring power with our trusty S121C with ThorLabs PM100-D readout (confirmed to be measuring at 1064 [nm] wavelength):