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--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 11:50, 11 March 2015 (CDT)
Quick Update:
*Wide-tune laser is designed, drawn and built. Seeing initial laser feedback. Now to see if I can get it performing well and to see if i can optimize the tuning range.
*Re: Laser linewidths: The interferometer has been set up for measuring linewidths at 1064, i think other Zach aligned it for us. I looked at two lasers we have on hand: the spare laser set up in our default way and the laser set up for rotating the grating about its face. Both had linewidths less than a MHz. Also looked at the experiment laser, initially the linewidth was quite large (few MHz), which may explain some difficulties with the crystal and why we haven't seen any narrow burned features. Attenuating the fast feedback gain to the diode and changing the laser driver seemed to bring the linewidth down to less than a MHz. When locked there was some evidence of further narrowing but the shape appears suspect and difficult to fit. We should probably look at this further.
*Re: EIT and experimental simulations: we looked at the delay between green and fluorescence but it was difficult to conclude when the fluorescence 'turned on'. Figuring out the effective gamma to use in simulations is still an unresolved question. We were able to measure AOM switching and observed times of 100ns or so, as expected. Another question is what effective density to use, have an estimate but this needs to be looked at more carefully as it contains a lot of assumptions. I don't think we're going to have much hope of seeing things until we have parameters really nailed down and a decent handle on a simulation.
*Re: In the crystal: trouble seeing anything when focused, but why?
--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 15:44, 2 March 2015 (CST)
Recent work, three main irons in the fire:
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