[Jeff, Torrey]

We want to try Koji's way of locking a cavity that allows for testing directly at the error point. This is done in MIM on the moku but using a LIA and LLB as the two slots. We set this up and observed a very funky looking error signal, which can be interpreted as an input misalignment. This was fixed. We locked with the laser and took a spectrum at the error point directly and at the control signal. We can confirm they differed by the controller. There were some peaks that were unique to the controller that disapeared/moved around depending on the span of the spectrum.

We then retook transfer functions with a laser lock and piezo lock now that we can probe the error point directly. We are able to get better information for the TF at low frequencies with this method.

Lastly there is some funny business happening in the error signal while the cavity is locked that we notice. It looks like wave packets and is periodic.