We got the fibre microscope, and I checked all the fibers tips in the green path with it, with necessary cleaning.

Attached is a simple report with pictures taken, for future reference and fiber handling.

Conclusion: After doing some gentle clean, all the on table fibre and long feed-through fibre tips look clean and good enough.

Power measured along the path:

• Before fibre coupler: 17.2mW
• Output from the short on-table fibre: 14.2mW  (Mode matching: 82.5%, did need to realign for a bit to get this value.)
• Output from the long fibre (just before entering feedthrough): 13.2mW (1 sleeve+long fibre: 93%)
• Total transmission: 76.7%.

This should be good enough for the next step to send the green light in and work on OPO.