Bots, Bureaucrats, Interface administrators, Suppressors, Administrators, Upload Wizard campaign editors
573
edits
David Notebook: Difference between revisions
Jump to navigation
Jump to search
→Daily Log
|
==Daily Log==
'''8/10/14'''
Running more tests with the PDA36A. I checked it from 5 to 100 nW as measured on the power meter (again though, I'm not very confident in it's measurements at the nW level--lots of fluctuations and hard to get 0 offset) and found the response to be logarithmic when the gain was set to 0 dB as I was using it on 8/8/14. I don't think this will work unless I can more accurately measure nW level beams with the power meter and then make a good regression equation for a logarithmic response. I then repeated these measurements with the gain at 60 dB and found the response to be much more linear. Data is [https://wiki.physics.wisc.edu/yavuz/images/2/29/Thorlabs_pda36a_response.xlsx here]. Maybe I can find the best gain setting that gives the most linear response at these powers and get a good linear fit at slightly higher beam powers and extrapolate to the single nW level event though I can't measure those powers well with the power meter.
'''8/8/14'''
I've abandoned the [[Thorlabs PDA10A Si Amplified Fixed Detector|Thorlabs PDA10A]] in favor of the [[Thorlabs PDA36A Si Switchable Gain Detector|Thorlabs PDA36A]]. It's fast enough to produce square waves at 400 Hz, and has a much larger sensor. It also has a lower minimum gain, which seems to work better when used in conjunction with the lock-in. I still should try to check if the response is linear at low powers. Ostensibly though, using it's different gain/
Accounting for the new factors, chopped 633 power is now:
| |||