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Mon Jan 28 18:02:04 2008
1.2MHz Laser intensity oscillation
While working on the PDH loop for the PMC I noticed
a 1.2MHz oscillation on the laser intensity:
- It seems to be a bistable state: it was generally
started by some transient in the piezo input of the laser.
- The oscillation persists even when all control inputs to the laser
(EOM, PZT, AOM) are disconnected.
- It's extremely strong: about 20% fractional modulation
- Power-cycling the laser usually fixes the problem.