Buildup dynamics of broadband Q-switched noise-like pulse

TL;DR

This paper studies the buildup process of broadband Q-switched noise-like pulses in a fiber laser, revealing the role of slow gain dynamics in their complex temporal and spectral instabilities through experiments and simulations.

Contribution

It introduces a gain dynamics model that enhances understanding of the nonlinear transient phenomena in ultrafast fiber lasers.

Findings

Slow gain dynamics significantly influence QS-NLP onset.

Experimental and simulation results show complex spectral and temporal instabilities.

The model provides deeper insight into nonlinear laser dynamics.

Abstract

We investigate the buildup dynamics of broadband Q-switched noise-like pulse (QS-NLP) driven by slow gain dynamics in a microfiber-based passively mode-locked fiber laser. Based on shot-to-shot tracing of the transient optical spectra and qualitatively reproduced numerial simulation, we demonstrate that slow gain dynamics is deeply involved in the onset of such complex temporal and spectral instabilities of QS-NLP. The proposed gain dynamics model could contribute to deeper insight into such nonlinear phenomenon and transient dynamics simulation in ultrafast fiber laser.