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 demonstrate, to our knowledge, the first operation of a simultaneous spatial combining and CPSA system that provides 9mJ from two amplifier channels and coherently stacks 81 pulses to a single pulse and compresses the output to ~515fs duration. This demonstrates that CPSA with spatial coherent combining enables energy scaling of ultrashort pulses with fewer parallel channels. Future work will involve increasing energy per channel, average power per channel, the number of fiber channels and reducing the pulse duration.
KEYWORDS: Fiber amplifiers, Ultrafast phenomena, Optical filters, Amplifiers, Linear polarizers, Linear filtering, Electronic filtering, Control systems
We report demonstration of a new spectrally-controllable device, based on a sequence of linear polarizers and birefringent plates, which allows to accurately and adjustably tailor its spectral filtering properties for achieving complete gain-narrowing compensation over ~30nm of signal bandwidth in an Yb-doped fiber system with the total gain reaching 150dB. The experimental demonstration was performed in a regenerative Yb-fiber amplifier system with controllable number of passes, allowing to characterize both signal spectral-narrowing, and as well as spectral compensation at varying levels of achieved total gain. This result opens a pathway towards 100fs duration multi-mJ pulses from fiber CPSA systems.
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