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--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 18:46, 6 February 2015 (CST)
Week in review. It's been an exciting week, we're finally doing some science! after spending a lot of time building things.
*Mon-put the ref cavity in a can; i should probably get some windows for that to further isolate it from the environment. We also did a little work with the crystal.
*Tue-more work with the crystal, hole-burning etc, temp in the lab spiked, destabilizing things.
*Wed-temp was wacked up, did some reading on spectral hole burning.
*Thur-Got back to the crystal. Spent a ton of time trying to get the laser int he exact right spot. The mode-hop-free tuning range is about the same size as the feature we want to see so it doesn't work very well for scanning, as you have to get it int he exact right spot and what you're looking for also has to be in the middle of the scan range. Remarkably, it cooperated for a little while. We were able to slowly ramp the laser piezo and lock the SHG cavity to the moving laser. This lets us scan the whole inhomogeneous linewidth and observe a burned feature 40MHz wide in the overall inhomogeneous linewidth. Needs to be improved if we are going get decent data, but we were able to see something!
*Fri- step back to document, try and digest what we've been looking at, a report with scope shots to follow.
Note: the laser mode-hopping doesn't appear to cause a problem for the fiber amp, this is good news!
A few questions/issues:
*Need a laser with a larger mode-hop-free tuning range if we are going to be able to scan over the whole thing.
*Need to resolve why it appears we can pump so much back into our hole; need to reconcile abs and fluorescence observations and straighten that out.
--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 17:33, 30 January 2015 (CST)
Experimenting with spectral hole burning. Burning with a 10mW laser, looking with a sweep that is ~1-2uW.
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