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Fri Oct 26 16:19:29 2007
We would like to measure the absorption of the mode cleaner optics. The plan is to repeat <a href="
">Valera's experiment</a> in which we track the MC's thermal resonances to infer their power absorption. Last night Rana and I hooked up a lock-in amplifier to heterodyne the MC servo signal by 28 kHz and piped the output into an ADC using the MC_AO channel. We did not find any resonances.
Valera recommends we drive the POS of the three MC optics with bandlimited noise to excite the resonances.