Scalar Nanosecond Pulse Generation in a Nanotube Mode-Locked Environmentally Stable Fiber Laser

TL;DR

This paper presents a stable, all-polarization-maintaining fiber laser that generates nanosecond, linearly polarized pulses using a nanotube mode-locking mechanism in a long, nonlinear fiber cavity.

Contribution

It demonstrates a simple, environmentally stable fiber laser design capable of producing nanosecond pulses with high polarization purity and stable output characteristics.

Findings

Produces 1.23 ns pulses at 1042 nm

Maintains 97% polarization degree

Stable output under cavity perturbations

Abstract

We report an environmentally stable nanotube mode-locked fibre laser producing linearly-polarized, nanosecond pulses. A simple all-polarization-maintaining fibre ring cavity is used, including 300 m of highly nonlinear fibre to elongate the cavity and increase intracavity dispersion and nonlinearity. The laser generates scalar pulses with a duration of 1.23 ns at a centre wavelength of 1042 nm, with 1.3-nm bandwidth and at 641-kHz repetition rate. Despite the long cavity, the output characteristics show no significant variation when the cavity is perturbed, and the degree of polarization remains at 97%.