Applied Physics B

, Volume 89, Issue 2–3, pp 275–279 | Cite as

Power locking of high-repetition-rate chirped pulse amplifiers

  • He Wang
  • Chengquan Li
  • Jason Tackett
  • Hiroki Mashiko
  • Christopher M. Nakamura
  • Eric Moon
  • Zenghu Chang
Article

Abstract

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-2f interferometers. The long term stability of the laser was kept to approximately 0.5% RMS.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • He Wang
    • 1
  • Chengquan Li
    • 1
  • Jason Tackett
    • 1
  • Hiroki Mashiko
    • 1
  • Christopher M. Nakamura
    • 1
  • Eric Moon
    • 1
  • Zenghu Chang
    • 1
  1. 1.J.R. Macdonald Laboratory, Department of PhysicsKansas State UniversityManhattanUSA

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