Generation of double-scale femto/pico-second optical lumps in mode-locked fiber lasers.
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.
Kobtsev
Sergey
S
Laser System Laboratory, Novosibirsk State University, Novosibirsk, 630090, Russia. kobtsev@lab.nsu.ru
Kukarin
Sergey
S
Smirnov
Sergey
S
Turitsyn
Sergey
S
Latkin
Anton
A