The attached table shows the amplitude of the green beat note when the end laser was in various states. We can increase the beat note amplitude dramatically by switching to a different states.
State 1
C1:GCX-GRN_REFL_DC: 638 counts
C1:GCV-XARM_BEAT_DC: (PSL blocked) 950 avg counts (zero = -794 counts)
amplitude of beat note: -23dBm (after PD + amps) (f ~ 30 MHz)?
C1:GCX-SLOW_SERVO2_OUT: 318 counts
State 2
C1:GCX-GRN_REFL_DC: 180 counts
C1:GCV-XARM_BEAT_DC: (PSL blocked) 1270 avg counts (zero = -794 counts)
C1:GCV-XARM_BEAT_DC: (PSL unblocked) 1700 avg counts (zero = -794 counts)
amplitude of beat note: -7dBm (after PD + amps) f = 60MHz
amplitude of beat note: 0dBm (after PD + amps) f = 30MHz
C1:GCX-SLOW_SERVO2_OUT: 290 counts
State 3
C1:GCX-GRN_REFL_DC: 220 counts
C1:GCV-XARM_BEAT_DC: (PSL blocked) 1120 avg counts (zero = -794 counts)
C1:GCV-XARM_BEAT_DC: (PSL unblocked) 1520 avg counts (zero = -794 counts)
amplitude of beat note: 0dBm (after PD + amps) f = 15MHz
C1:GCX-SLOW_SERVO2_OUT: 305 counts
PSL temp = ??
C1:PSL-FSS_SLOWM = -3.524
|