I measured the slope of the error signal for ACAV path to be 200 kHz/V. This will be used for calibration the error point noise to frequency noise.
See some details about the error signal's slope and calibration in psl:562.
THe setup for ACAV path is
Next: Measure the slope at RCAV path, measure error noise from both loops, compare to beat signal.
Plan for opening the chamber:
I'm certain that the beam reflected from the window that overlaps with the reflected beam from the cavity going to the RFPD causes a lot of noise. This should show up in the error noise. So to avoid the reflection from the window, I have open the chamber to turn the cavity axis a bit. I need to: