Mode-locked Yb-doped fiber laser emitting broadband pulses at ultra-low repetition rates

TL;DR

This paper presents a stable, environmentally robust Yb-doped fiber laser capable of generating broadband, ultrashort pulses at ultra-low repetition rates, achieved through precise cavity design and mode-locking techniques.

Contribution

The work introduces a novel all-normal dispersion, all-PM fiber laser design that produces stable broadband pulses at unprecedented low repetition rates of 506 kHz.

Findings

Repetition rates as low as 506 kHz achieved

Pulses are compressible to sub-500 fs durations

Laser exhibits environmental stability

Abstract

We report on an environmentally stable, Yb-doped, all-normal dispersion, mode-locked fibre laser that is capable of creating broadband pulses with ultra-low repetition rates. Specifically, through careful positioning of fibre sections in an all-PM-fibre cavity mode-locked with a nonlinear amplifying loop mirror, we achieve stable pulse trains with repetition rates as low as 506 kHz. The pulses have several nanojules of energy and are compressible down to ultrashort (< 500 fs) durations.