I succeeded in locking the end green laser to X arm with the new ETM.
Though the lock is still not so stable compared to the previous locking with the old ETM. Also the beam centering is quite bad now.
So I will keep working on the end green lock a little bit more.
Once the lock gets improved and becomes reasonably stiff, we will move onto the corner PLL experiment.
- beam centering on ITMX
- check the mode matching
- revise the control servo