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--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 18:23, 29 January 2015 (CST)
We are finally back to doing science again! In the last week or so we have the laser locking well to a cavity and seeding the fiber amplifier. Fiber amplifier provides way more power to the SHG cavity. There is still ringing on the SHG output, but it seems to work OK; we could potentially mess with the lockbox parameters to get a cleaner lock. Nick has the AOM beams set up.
Today we finally went looking for hole burning again. We see evidence of it, but it doesn't look as narrow as we would hope, appears to be more like ~5-10MHz wide, when it should be more like the laser ~1MHz (locked actually more like 50kHz?- need to measure this). Perhaps this cavity is fluctuating significantly, (few MHz) or there is some other issue. Presumably, we could up the burning power but burn for less time, giving us a narrower feature? So far we have not observed such behavior yet. So far we have looked with about 1uW of power and burned with much more, up to ~1mW or so for a second.
We're doing science again! Next:
*look at inhomogeneous broadening again, might as well with the more stable laser.
*mess with lock parameters to get more stable/narrower laser?
*ref cavity change?
--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 17:30, 21 January 2015 (CST)
Added a pick-off to monitor laser on spectrum analyzer/wavemeter. Seems well behaved compared to the previous laser. This is quite encouraging. Have the fiber amp seed launch moved toward to the inside of the table, should protect it a little/keep it out of the way. Next is to mode-match the fiber laser output to the SHG cavity.
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