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==
'''11/18/14'''
Hot damn! 0.05 atm might be the magic pressure. 1555 locked again today with only small adjustments. Good settings seem to be integrator at 5 kHz, differentiator at 500 kHz (this definitely seems the best setting for all pressures). Differentiator gain seems to give a trade off between power and stability. Prop. gain around 3.75. Optical feedback at 1.4 V (I didn't realize the scale on the oscilloscope had changed--I've normally been doing around 400 mV, but this actually worked well with different gain settings. Maybe more optical feedback, less gain is better if I can get it to work).
'''11/17/14'''
I've been mostly still trying different locking settings. The 1555 is amazingly inconsistent and I'm not sure what's really changing day to day. Both locks work better under lower pressure though, so I've been trying to find a good compromise between getting 633 generation and easy locking. 0.38 V (0.05 atm) seems like a good spot. There's 633 at a fair number of cavity modes, and it's easily visible in mirror or on the photodiode. I'm going to stick just at this pressure for a while and maybe I'll be able to learn more about locking just at this pressure.
| |||