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--[[User:Zjsimmons|Zjsimmons]] ([[User talk:Zjsimmons|talk]]) 11:59, 15 January 2015 (CST)
So it appears that the mirror reflectivity for the invar cavities is so high it is making them hard to work with. Ordered a broadband (lower reflectivity) mirror from thorlabs, we'll see if that helps.
In the meantime, i've been working with the other "new" laser i have been working on, i would like to get it in the bullpen. There was really no reason it wasn't working, i just needed to keep playing with it until i found some feedback. Interestingly, i think the tilt of the grating was insufficient to get feedback at the correct wavelength, apparently this was why it wasn't working/showing any feedback.
Initially i noticed feedback with the polarization of the laser diode oriented 90 deg to what I expected, this lead me to compare to the other diodes but they are in fact the same. I then changed the grating angle to get the correct output wavelength. Maybe i was just unable to get the grating angle close enough before to observe any feedback.
At this point the feedback i not very good, it is not a single peak (in output power vs tilt space), but a hill with many sharp peaks that have different output wavelengths, hopefully I can tune it up to get better performance.
--[[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:
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