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David Notebook: Difference between revisions
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I've been mostly still trying different locking settings. The 1555 is amazingly inconsistent and I'm not sure what's really changing day to day. Both locks work better under lower pressure though, so I've been trying to find a good compromise between getting 633 generation and easy locking. 0.38 V (0.05 atm) seems like a good spot. There's 633 at a fair number of cavity modes, and it's easily visible in mirror or on the photodiode. I'm going to stick just at this pressure for a while and maybe I'll be able to learn more about locking just at this pressure.
It also occurred to me that we might be able to run the lasers are higher power. The limiting factor is the isolators, but the 1064 one is rated for 60 W and 500 W/cm^2. We're obviously under 60 W, and I think our intensity is ok too. At 30 W of input, we would need a beam larger than 1.4 mm. I'll measure it when I get a chance. The isolator's aperature is 4.7 mm, so we could always expand the beam and re-collimate it after. That would be a lot of trouble, but we could increase our single beam conversion efficiency by 50%.
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