1.06 kW all-fiberized polarization-maintaining femtosecond master-oscillator power-amplifier incorporating passive pulse shaping

초록

We report a high-power, high-repetition-rate, Yb-doped fiber femtosecond master-oscillator power-amplifier (MOPA) system. Based on all-fiber-based chirped pulse amplification configuration comprising a Yb fiber mode-locked seed source, a five-stage repetition-rate multiplier, three Yb-doped fiber amplifiers, and a pulse compressor, the MOPA system yielded 1.06 kW of femtosecond pulsed output at 1040 nm with a pulse duration of 356 fs at a repetition rate of 1.83 GHz. Furthermore, a modified seed source incorporating spectral reshaping and additional pulse stretching enabled an improved compressed pulse shape with significantly reduced sidelobes, leading to a shorter pulse duration of 275 fs at the maximum output power. The prospects for a further increase in power and energy via this approach are considered. © The Author(s), 2026. Published by Cambridge University Press in association with Chinese Laser Press.

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