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David Notebook: Difference between revisions
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'''10/7/14'''
Ordered 2 HeNes from Ebay so we can return the ones we've been borrowing from the optics lab. I've been wondering if maybe the amount of optical feedback isn't right for the 1555 locking circuit. I was able to get kind of a lock with only the first integrator on (20 kHz). Then I adjusted the optical feedback and then the proportional gain. The best performance seemed to be between 2-3 V optical feedback when the circuit isn't locked. It's currently set at 2.5V, which will give some locking with the proportional gain course knob 2 clicks up and the fine gain most of the way up.
I tried switching to the current 1064 slow lock (the old 1555 lock--i.e. the one that says 1555) (the 1064 is broken :( )) still with the vescent for the fast lock. Performance was still bad--I'd got a consistent "lock" with only power of a few mW transmitting from the cavity. The lock is still very "fuzzy"--not really a jump up in signal but rather the whole signal looks very noisy. I noticed that the DC error output on the vescent box is noisy, with a signal at very close to 1 kHz. The error signal seems noisy too.
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