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David Notebook: Difference between revisions
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==Daily Log==
'''1/8/15'''
Nick had the really good idea that my peaks might be so unstable because I wasn't ramping at a high enough frequency (James from Saffman said this can be a problem), and I don't think I was at a high enough amplitude either. I switched to the external ramp and it looks much better now. I think I'm seeing a few free spectral ranges with not much non-0,0 modes, but the reflected signal is very weak (I can't really see it). I'm going to try locking though and see if I can get anything. I'm just using the vescent box for the 1064 cavity beam, so here are the current locking parameters for when I need that to work again:
First integrator: 10 KHz
Second integrator: off
Differential: 500 KHz
Differential gain: 22 turns
Auxiliary servo gain: 4.5 turns
Proportional gain: 3.3 clicks
Phase delay line: ~9'2"
'''Winter Break Update'''
'''Pre-stabilizing cavity'''
Wow, I've really let this get out of date. We've moved forward with the pre-stabilizing cavity idea. We needed to buy a lot of optics, but realized we could get away without another EOM by just picking off after the EOM on the main experiment. Even when we feedback to the same current driver, the error signals shouldn't interfere with each other, because their frequency components ultimately depend not just on the EOM modulation frequency, but on the cavity length too.
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