Jennie W, Keita K,

While the laser was off and the chamber closed we measured the response function between the JAC PZT driver and the JAC TRANS A PD. We expect some coupling as the two cables are routed together along the table and to the feedthrough.

See the attached plot. The red measurement was at a whitening gain of 10 dB in Beckhoff with the -10dB filter engaged on the JAC TRANS A LF filter bank. The blue measurement is with the whitening gain at its nominal of 30dB, with the -30dB filter engaged in the filter bank instead.

We don't know yet if this level of coupling will affect us until we start locking again at our nominal input power.