Amplifier similariton generation from a Yb-doped all-normal-dispersion fiber laser employing a hybrid-mode-locking technique

Apart from the classical nonlinear polarization rotation (NPR) mechanism, we incorporate an additional stabilization mechanism of frequency shifting in a Yb-doped all-normal-dispersion fiber laser oscillator. The similariton pulse with a pulse duration of 7.8 ps and a spectrum width of 20.5 nm is generated. By using a grating pair, the pulse duration can be compressed to be 140 fs. By employing time-stretch dispersion Fourier transform (TS-DFT) technique, the mode-locking pulse buildup process is investigated. The use of frequency shifting as a stabilization technique opens a new route towards reliable laser oscillator fabrication for the industrial-grade system.