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--[[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.
Observations:
*Spectral hole is perhaps wider than we expect: We need to look at the laser linewidth, but i was thinking we would we see a hole ~1MHz wide and instead its more like ~10-15MHz wide.
*Temperature change-> ref cavity length-> laser wavelength->hole position: We heated the cavity with the heat gun for a fraction of a minute, see the transmission peak (spectral hole) fall out of the scan range. Also as the cavity length was changing and laser changing color, when we burn a hole the hole is large and shallow, this makes sens as the laser was effectively scanning.
*Hole persists for a long time: We see the hole minutes after its creation, as it drifts out of and into view.
*Big question: does burning a hole wipe out an adjacent hole?
--[[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.
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