Abstract

We report on high-energy ultrashort pulse generation from a passively mode-locked ytterbium-doped large-mode-area photonic crystal fiber oscillator operating in the anomalous dispersion regime. In the single-pulse regime, the laser directly generates $880\mathrm{mW}$ of average power of sub-$500\mathrm{fs}$ pulses at a repetition rate of $53.33\mathrm{MHz}$, corresponding to a pulse energy of $16.5\mathrm{nJ}$. Stable and self-starting operation is obtained by adapting the spot size at the saturable absorber mirror to the pulse evolution in the low-nonlinearity fiber. The approach presented demonstrates the scaling potential of fiber based short pulse oscillators towards the $\mu \mathrm{J}$-level.

© 2007 Optical Society of America

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