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David Notebook: Difference between revisions
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→1064 Laser Notes
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'''Threshold tests''' Usually get around 100 μW at 20 mA of current. A small adjustment of the diffraction grating (~a quarter turn total) will usually show little adjustment in output power, except for a narrow spike and drop off near the optimal grating feedback setting.
'''8/27/14''' Retuned temperature loop on the Vescent laser controller. We had been having current fluctuations for the past few weeks but this seemed to solve the problem.
'''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.
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