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Jared lab notebook: Difference between revisions
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The TA before the second High frequency seems very sensitive to alignment. Over the course of the day it got unaligned, and I had some trouble getting it back, about 265 mW out of that to get ~170 through the high frequency AOM.
--[[User:Jmiles2|Jmiles2]] ([[User talk:Jmiles2|talk]]) 23:08, 1 July 2014 (CDT)
Standing wave working much better now, up to 25%, not sure why. The last thing I did was realign the coupling beam from ChB on to ChC, it didn't seem to do much, the power I got through the fiber went from ~4.98mW to ~5.02mW, not much at all. I also did the threshold test on the seed laser again, it did improve it, but I didn't see a better standing wave immediately after. It also looks there is some asymmetry with the standing wave. I get different results whether ChC or ChB has the larger coupling beam power.
While things were working, I checked to see if the collection size (how many camera pixels I take as data) affected the percent difference between nodes and anti-nodes. I doubled the size and saw little difference.
I see a good standing wave with the Big FORT laser. Maybe some narrowing too. I might have even been using the wrong settings, I think I was using the saved state 9 on the delay generator instead of 8. They should both be very similar, so I don't think it's a huge problem, but I can't remember for sure which one I was using for the data I was taking, it should be 8 but I think it might have been 9 for some of it.
Either way, I still got really good contrast with the standing wave, and contrast with the larger FORT.
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