We theoretically and experimentally show coherent pulse stacking (CPS) can accommodate tens-of-fs pulse durations and has negligible stacking fidelity degradation with increased pulse bandwidth. Simulations prove large number of tens-of-fs pulses can be stacked with high pre-pulse contrast. In an experiment, nine spectrally broadened and fiber amplified pulses are stacked using four cascaded cavities. CPS of pulses with different spectral bandwidths, up to 75 nm base-to-base (<50 fs transform-limited duration), are tested, showing negligible stacking degradation due to increased bandwidth. This work provides a path towards high energy, tens-of-fs pulses from ultrafast fiber lasers.
We demonstrated 55-fs pulses from spectrally combining two chirped-pulse fiber channels operating at partially-overlapped spectral bands, with a pulse shaper incorporated in each channel. The spectral intensity and phase shaping in two fiber channels are coherently-spectrally synthesized by phase-synchronizing the two channels at the overlapped spectrum. To the best of our knowledge, 55 fs is the shortest pulse duration from a spectrally combined fiber system at one-micron Yb wavelength, and this work is the first demonstration of coherent spectral synthesis of two pulse shapers. This work provides a promising path toward high-energy, tens-of-fs fiber chirped-pulse amplifier systems.
We have developed a scalable, ultrafast laser beam combination scheme, which can combine many beams using two diffractive optics. A feature of this approach is the information contained in the uncombined output beams, which can be used to derive phase error information. We show that a machine-learning algorithm can learn to stabilize beam combination with high efficiency, by finding correlations between uncombined output beam patterns and phase errors.
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