All-optical wavelength-tunable narrow-linewidth fiber laser

TL;DR

This paper demonstrates an all-optical, wavelength-tunable narrow-linewidth fiber laser with rapid tuning capabilities and a linewidth of approximately 750 Hz, utilizing graphene's optical-thermal effects and stimulated Brillouin backscattering.

Contribution

It introduces a novel all-optical control method for narrow-linewidth fiber lasers using graphene's optical-thermal effects, achieving fast tuning and linewidth suppression.

Findings

Tuning speed of 140 MHz/ms achieved

Wavelength-tuning range of 3.7 nm demonstrated

Linewidth suppressed to ~750 Hz

Abstract

Parameter regulations of narrow-linewidth fiber lasers in frequency domain has drawn considerable interests for widespread applications in the light quantum computing, precise coherent detection, and generation of micro-waves. All-optical methods provide compact, precise and fast accesses to achieving these lasers with wavelength-tunability. Here, the optical-thermal effects of graphene is utilized to precisely control operations of free-running lasers with a tuning speed of 140 MHz/ms. Assisted by the single-longitude-mode operation and linewidth suppression of stimulated Brillouin backscattering, we obtain an optical-controllable ~750 Hz fiber laser with a wavelength-tuning range of 3.7 nm.