I tried to lock IMC to the NEOLASE laser.

Firstly, I put a half-wave plate for the new laser to adjust the polarization to S for PMC and EOMs downstream.

PMC can be locked with the NEOLASE with 9A current like the last time. This time I injected almost 20W to the PMC which is similar power to the current FB laser to make it easy for gain adjustment or something.

Then I switched some cables and modified the guardian code as klog:25843. After some adjustment of wide-band EOM gain, IMC could be locked for at least several minutes, but only SLOWBOOST and 2 of 3 COMMONBOOST could be engaged. I tried higher or lower gain for wide-band EOM, but it did not work.

I need more careful measurements for open-loop TF, cross-over frequency, UGF, etc with somebody's help next time.