Linearly polarized, Q-switched Er-doped fiber laser based on reduced graphene oxide saturable absorber

TL;DR

This paper reports a passively Q-switched Er-doped fiber laser producing linearly polarized pulses with high polarization purity using a reduced graphene oxide saturable absorber and PM fibers, achieving specific pulse duration, energy, and repetition rate.

Contribution

It introduces a fiber laser design that combines polarization maintaining fibers with a rGO saturable absorber for stable, linearly polarized Q-switched pulses.

Findings

Achieved 97.6% degree of polarization.

Generated 1.85 microsecond pulses.

Operated at 115 kHz repetition rate.

Abstract

We demonstrate generation of linearly polarized pulses from a passively Q-switched Erbium-doped fiber laser. The cavity was designed using only polarization maintaining (PM) fibers and components, resulting in linearly polarized output beam with degree of polarization (DOP) at the level of 97.6%. Reduced graphene oxide (rGO) was used as a saturable absorber for Q-switched operation. The laser was capable of delivering 1.85us pulses with 125nJ pulse energy at 115kHz repetition rate.