David Notebook: Difference between revisions

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==Daily Log==
'''8/12/14'''
Got to a maximum of 3.3 nW chopped power, for a conversion efficiency of <math> 4.1 *10^{-7} </math>. Again, I'm not sure if these powers are scaled properly since I've gotten somewhat different values with every technique, but they do at least some linear at this point. I'm increasing the gas pressure from 0.1 atm to 0.15 atm.
 
'''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 dependant--sometimes a lock will produce almost no 633. I think this is probably a result of being at lower pressure (0.1 atm).

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