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David Notebook: Difference between revisions
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0.25 atm: 5.8 nW; efficiency of <math> 7.3 * 10^{-7} </math>
At higher pressures the difference in power between modes greatly decreased.
'''8/11/14'''
Using the regression equation from the data for the PDA36A, and accounting for the 16% higher power 633 nm light should have from the sensitivity differences, P=1.77V with power in nW and the lock-in set at 5 mV and the photodiode at 60 dB gain. I was getting chopped powers of about 2.3 nW today which is lower than what I calculated using the previous photodiodes. The 633 light seems noticeable brighter to me though. I'm not sure which is the best measurement--all the methods seem somewhat inconsistent. 633 generation is also much more mode
I'm going to try to stick to this photodiode for a while if I can. I'm still not sure if powers are converting correctly, but from my measurements yesterday it at least seems to be acting linearly and so I can compare measurements at different pressures and alignments. I should be able to easily normalize any measurements past this point if I discover the conversion factor isn't correct as long as the response is linear. I'm also going to keep the lock-in at the 5 mV scale as long as it's practical, since the output doesn't always seem to scale exactly with the sensitivity as would be expected. I'll work at 0.1 atm for another half day tomorrow to make sure I can't improve the generation and then start increasing the pressure.
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