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David Notebook: Difference between revisions
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'''7/3/14''' Threshold test seemed off yesterday and was very off today. It took about 26 mA today to get to 100 μW and the laser was very multimode. Adjusting the grating position ultimately resolved the problem. The current reading on the driver is sometimes fluctuating, usually just by .1 mA, but sometimes by up to 5 mA. This doesn't seem to be causing any problems right now, but it is unclear why this is happening.
==Long Term Ideas==
*Use laser diode instead of TA for the 780 beam? Thorlabs makes a 400 mW single mode one. Probably get as much power in the cavity and there would be way few optics that could become misaligned. The beam would also likely be better collimated and a telescope could work to shrink it.
*Use an extra beam cube/waveplate to dump the "bad" part of the 1064 beam. Still about .5 W comes through when the waveplate is set to give the minimum. Does this polarization just not help much or does it hurt performance?
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