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David Notebook: Difference between revisions
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==Things to Do/Check==
*<strike> Check the RF generator with the giant screen--is it actually broken and putting sidebands on or is it set to modulate the primary signal? </strike> '''not broken'''▼
▲*Check the RF generator with the giant screen--is it actually broken and putting sidebands on or is it set to modulate the primary signal?
*Return HeNe? Doesn't really work...
*Upload power meter data
*What's wrong with the IR viewer? '''broken bulb thing'''
==Questions for Deniz==
==Daily Log==
'''10/29/14'''
I don't think the cavity leak is a problem for now--don't usually run it at less than 0.1 atm, or 760 mV, so the leak is a pretty small fraction of that. I got both locks working individually, but when trying to lock together the 1064 beam seemed to interfere with the 1555 lock. I think it's the generated 807, since there would only be interference in cavity modes where 633 was being generated (and so 807 was also). This is probably fixable with just a notch or bandpass filter. I also noticed that the error signal on the 1555 was very noisy again, at least compared to the 1064. Not the 1 kHz noise I was getting for a while, but just generally very staticy. I'm not sure if this is new or I just didn't notice it before. I eventually tracked it down to the low-pass filter, which doesn't seem to be doing anything. Switching it with the 1064 one fixed it. It's not locking well now, but presumably I'll have to retune some parameters now that there is a working low-pass filter and that there is gas in the cavity.
'''10/24/14'''
I think the cavity has a small leak. At room temperature, it will pump down to ~12 mV, but will be up at ~30 mV by the next day. This is probably too small to be a big deal, but I should check with Deniz.
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