Crystals (Oct 2021)

Timing Fluctuation Correction of A Femtosecond Regenerative Amplifier

  • Keyang Liu,
  • Hongyang Li,
  • Xinliang Wang,
  • Yanqi Liu,
  • Liwei Song,
  • Yuxin Leng

DOI
https://doi.org/10.3390/cryst11101242
Journal volume & issue
Vol. 11, no. 10
p. 1242

Abstract

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We report on the long-term correction of a timing fluctuation between the femtosecond regenerative amplifier and the reference oscillator for the seed 100 PW laser system in the Station of Extreme Light (SEL). The timing fluctuation was characterized by a noncollinear balanced optical cross-correlator that maps the time difference to the sum frequency intensity of the amplifier and oscillator laser pulses. A feedback loop was employed to correct the timing jitter by adjusting the time delay line in the amplifier beam path. The timing fluctuation was reduced to 1.26 fs root-mean-square from hundreds of fs over 10 hours. Benefitting from excellent performance and long-term stability, this timing jitter correction scheme, as a component of optical synchronization in the 100 PW laser facility, will be integrated into SEL.

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