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David Notebook: Difference between revisions
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==Daily Log==
'''7/11/14'''
Spent the last 2 days setting up the beam chopper and a lock-in amplifier for it. It works very well and after sending the HeNe through 2 irises I could easily measure it 1 nW. I thought I was seeing a signal at one point that only appeared when locking when the 780 was one, but I haven't been able to replicate it yet. It's difficult to optimize the settings on the amplifier since I can only lock the 1064 for a second or two at a time. Is there some way I can do it while ramping instead?
'''7/9/14'''
Testing the 633 filter showed it lets through about 90% of 1555. We want to determine that most of the scattered light is 1555 like we think. So far we know the signal appears only when locking 1064 and that the cavity window cuts the signal by a factor of 5. It also seems to be only scattered light because blocking the path from the grating does not affect the signal.
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