Abstract
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.
Highlights
In the past few decades, the advent of the chirped pulse amplification (CPA) and optical parametric chirped pulse amplification (OPCPA) techniques has greatly promoted the development of super-intense ultrashort lasers [1,2]
High-power femtosecondlevel laser systems based on CPA and OPCPA techniques have achieved an output power of several petawatts (PW), even the 10 PW level [3,4,5,6,7,8,9,10]
The seed pulses are split into several parts in OPCPA and optical parametric amplification (OPA) laser systems, which are used as the signal and pre-pump pulses, respectively [6,19,20]
Summary
In the past few decades, the advent of the chirped pulse amplification (CPA) and optical parametric chirped pulse amplification (OPCPA) techniques has greatly promoted the development of super-intense ultrashort lasers [1,2]. Light Studies (XCELS), and Optical Parametric Amplifier Line (OPAL) [11,12,13,14] Such extreme physical conditions have opened up many significant research fields, including laboratory astrophysics, particle acceleration, nuclear physics, and fast ignition [15,16,17,18]. By correcting the optical path length and optimizing the dispersion of the seed pulses, we decreased the timing fluctuation between the regenerative amplifier and oscillator pulses to 1.26 fs root-mean-square (RMS) over 10 h, which implies excellent long-term stability. This timing fluctuation correction system will be integrated into the pulse synchronization system of SEL
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