The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors from Sbox installed.

The last finesse measurement that was done gave a Finesse of ~ 19300 (After cleaning M2 using ethanol + aceton + pure water)

on Friday the whole optical table was cleaned again and the inside of the box was cleaned (even with a lot of dust inside the box the Finesse was 19300 )

all the mirrors were cleaned after using the three steps, M3 and M4 had clear visible dust on them.

D-shaped mirrors were installed again between M1 and M2

The alignment was redone and the beating observed ,  There is still a need for alignment improvement.

the cavity is under vacuum ~ 4.8*10^-2 mbar on Friday evening (~ 19h00) , The cavity is yet to be locked and to measure its Finesse

A PowerPoint showing the last finesse measurement and the error signal of the menhir laser lock