Pulse generation without gain-bandwidth limitation in a laser with self-similar evolution

Chong, A.; Liu, H.; Nie, B.; Bale, B.G.; Wabnitz, S.; Renninger, W.H.; Dantus, M. and Wise, F.W. Pulse generation without gain-bandwidth limitation in a laser with self-similar evolution. Optics Express, 20 (13), pp. 14213-14220.

Abstract

With existing techniques for mode-locking, the bandwidth of ultrashort pulses from a laser is determined primarily by the spectrum of the gain medium. Lasers with self-similar evolution of the pulse in the gain medium can tolerate strong spectral breathing, which is stabilized by nonlinear attraction to the parabolic self-similar pulse. Here we show that this property can be exploited in a fiber laser to eliminate the gain-bandwidth limitation to the pulse duration. Broad (∼200 nm) spectra are generated through passive nonlinear propagation in a normal-dispersion laser, and these can be dechirped to ∼20-fs duration.

Publication DOI: https://doi.org/10.1364/OE.20.014213
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
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Uncontrolled Keywords: ultrafast lasers,pulse shaping,fiber optics ,amplifiers ,oscillators,Atomic and Molecular Physics, and Optics

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