140 kHz, 1.2 ps pulses from an all-PM Yb-doped fiber master oscillator-power amplifier

Abstract

We report on an environmentally stable mode-locked all polarization maintaining fiber laser with a nonlinear amplifying loop mirror (NALM) at a ultralow repetition rate. Experimentally, using different cavity lengths we have achieved stable mode-locking at different repetition rates. By carefully adjusting the length of the total fiber of NALM, we achieve stable broadband pulse trains with a repetition rate as low as 140 kHz. The pulses can be further amplified up to 27 µJ and compressed down to 1.16 ps. The laser system has potential application for industrial application.