Power locking of high-repetition-rate chirped pulse amplifiers

  • J R Macdonald Laboratory
  • Published 2007


We report a feedback control scheme that minimizes the energy fluctuations of high power femtosecond pulses from a 1 kHz laser amplifier. The pulse energy variation in the frequency bandwidth 0–500 Hz was obtained by a photodiode and a low pass filter. The measured signal was fed to a proportional-integral-derivative (differential) (PID) controller that changed the amplitude of the high voltage pulses applied to a Pockels cell. The variation of average power was reduced from 1.33% RMS to 0.28% RMS, which improved the carrier-envelope phase stability from 500 mrad to 200 mrad as measured by two f -to-2 f interferometers. The long term stability of the laser was kept to approximately 0.5% RMS. PACS 42.60.Jf; 42.60.Lh; 42.60.By

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@inproceedings{Laboratory2007PowerLO, title={Power locking of high-repetition-rate chirped pulse amplifiers}, author={J R Macdonald Laboratory}, year={2007} }