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--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 19:53, 12 January 2015 (CST)
Crunch time. So i machined 2 invar reference cavities, completed before the break. David is using one and i'm working with the other. So Far I have not been able to get good mode-matching, not good enough coupling to lock to it. Potential issues:
-higher finesse than the other cavity so the ramp has to be better?
-perhaps we need input wedge to avoid disturbing the seed laser?
Also, ordered new circuit boards for the lock box, tried to incorporate most everything i could think of. Omitted the op-amp based ffb and generally streamlined it. Hopefully it works better.
Getting locked to a ref cavity is our number one priority.
--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 15:59, 17 December 2014 (CST)
So feedback electronics issues are driving me crazy and i'm giving that a rest. Serendipitously, the material for the invar fabry-perot cavities just arrived and i've started working on that. Hopefully after doing this, looking at the circuit with fresh eyes will yield some ideas/progress.
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