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Opt Express. 2009 Nov 9;17(23):20707-13. doi: 10.1364/OE.17.020707.

Generation of double-scale femto/pico-second optical lumps in mode-locked fiber lasers.

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Laser System Laboratory, Novosibirsk State University, Novosibirsk, 630090, Russia.


We observed generation of stable picoseconds pulse train and double-scale optical lumps with picosecond envelope and femtosecond noise-like oscillations in the same Yb-doped fiber laser with all-positive-dispersion cavity mode-locked due to the effect of non-linear polarization evolution. In the noise-like pulse generation regime the auto-correlation function has a non-usual double (femto- and picosecond) scale shape. We discuss mechanisms of laser switching between two operation regimes and demonstrate a good qualitative agreement between experimental results and numerical modeling based on modified nonlinear Schrödinger equations.

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