Squeezer recovery work after pumping down:

• Squeezer laser was back on
• SHG was locked
• Green fiber polarization adjustment: Very good. Reached to only 0.00~0.01mW on SHG Fiber Rejected by adjusting the HWP/QWP on ISCT6 and stable.
• PDs were re-aligned, including OPO Trans, OPO REFL, OPO REFL Rejected and OPO IR.
• SEED input diode re-calibrated

A quick cavity scan with green beam, as attached below.

Calculation:

• 00 mode: 89%
• Misalignment: 5.8%
• Mis-mode matching: 3.8% (Mode matching efficiency = 96%)
• A higher mode: 1.4%

This is pretty much better than before, and consistent with the scan in-air.