Dissipative soliton resonance in a full polarization-maintaining fiber ring laser at different values of dispersion.

I Armas-Rivera,G Beltrán-Pérez,A Díez,M V Andrés,C Cuadrado-Laborde,E A Kuzin,A Carrascosa

doi:10.1364/oe.24.009966

Abstract

We investigated the dissipative solitons resonance in an ytterbium-doped fiber ring laser in which all the elements are polarization maintaining (PM). A semiconductor saturable absorber mirror was used as a mode-locker. The cavity included a normal dispersion single-mode fiber (SMF) and an anomalous dispersion photonic crystal fiber. The change of the length of the PM SMF allows the variation of the net-normal dispersion of the cavity in the range from 0.022 ps2 to 0.262 ps2. As the absolute value of the net-normal dispersion increases from 0.022 ps2 to 0.21 ps2, a square-shaped single pulse transformed to a single right-angle trapezoid-shaped pulse, and, at the dispersion of 0.262 ps2, to multiple right-angle trapezoid-shaped pulses, per round-trip.

Highlights

Mode-locked fiber lasers represent a unique system capable to generate a variety of pulse shapes
We investigated the dissipative solitons resonance in an ytterbium-doped fiber ring laser in which all the elements are polarization maintaining (PM)
In that work it was found that the pulse shape depends on the dispersion value; and in the normal dispersion region, it transforms from Gaussian-like to flat-top shape while the value of the dispersion approaches to the resonance curve

Summary

Introduction

Mode-locked fiber lasers represent a unique system capable to generate a variety of pulse shapes. The generation of the square-shaped pulses did not obtain a great attention until it was shown that at a given set of laser parameters, the energy of the pulses circulating in the cavity may grow indefinitely [5]. It was shown that an increment of the saturation energy (i.e. pump power in experiments) results in the transformation of the Gaussian-looking pulse shape to the flat-top shape and the increment of the pulse duration at constant peak power. The square-shaped pulses with duration increasing with pump power was demonstrated using figure-of-eight lasers [18,19,20,21,22] and fiber ring lasers using graphene as mode-lockers [23,24]. Very recently rectangular pulses were reported in a laser based on topological insulator saturable absorber [25]

Methods

Results

Conclusion