Characterization and compression of dissipative-soliton-resonance pulses in fiber lasers

TL;DR

This paper investigates dissipative-soliton-resonance pulses in fiber lasers, revealing their unique spectral and temporal properties, and demonstrates their compression from 63 ps to 760 fs both numerically and experimentally.

Contribution

It provides the first experimental demonstration of DSR pulse compression and characterizes their distinctive spectral and temporal behaviors in fiber lasers.

Findings

DSR pulses have flat-top temporal profiles and rectangular spectra.

The spectrum remains unchanged with increasing pulse energy, except for a central peak.

DSR pulses can be compressed from 63 ps to 760 fs.

Abstract

We report numerical and experimental studies of dissipative-soliton-resonance (DSR) in a fiber laser with a nonlinear optical loop mirror. The DSR pulse presents temporally a flat-top profile and a clamped peak power. Its spectrum has a rectangle profile with characteristic steep edges. It shows a unique behavior as pulse energy increases: The rectangle part of the spectrum is unchanged while the newly emerging spectrum sits on the center part and forms a peak. Experimental observations match well with the numerical results. Moreover, compression of the DSR pulses is both numerically and experimentally demonstrated for the first time. An experimentally obtained DSR pulse of 63 ps duration is compressed down to 760 fs, with low-intensity pedestals using a grating pair. Before being compressed to its narrowest width, the pulse firstly evolves into a cat-ear profile, and the corresponding autocorrelation trace shows a crown shape, which distinguishes itself from properties of other solitons formed in fiber lasers.