Abstract

We report a passively mode-locked all-fiber laser with bidirectional pumping, emitting high-energy wave-breaking-free pulses. Experimental investigations show that forward and backward pump powers mainly contribute on the chirp and the nonlinear phase shift of pulses, respectively. Nonlinear chirp pulses with $50\mathrm{nJ}$ pulse energy, $340\mathrm{ps}$ duration at a $8.2\mathrm{MHz}$ repetition rate are directly emitted from the all-fiber laser pumped by two $550\mathrm{mW}$, $977\mathrm{nm}$ laser diodes. The pulses cannot be compressed to near the transform limit, showing that the chirp of pulses is nonlinear.

© 2011 Optical Society of America

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