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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42.60.Jf; 42.60.Lh; 42.60.By
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Wang, H., Li, C., Tackett, J. et al. Power locking of high-repetition-rate chirped pulse amplifiers. Appl. Phys. B 89, 275–279 (2007). https://doi.org/10.1007/s00340-007-2774-8
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DOI: https://doi.org/10.1007/s00340-007-2774-8