Spectral adjustment of a powerful random fiber laser

TL;DR

This paper presents a high-power, linearly polarized random fiber laser with independently tunable wavelength and linewidth, achieved through spectral adjustment using a bandwidth-adjustable tunable optical filter, enabling versatile applications.

Contribution

First demonstration of a high-power linearly polarized RFL with independent spectral tuning of wavelength and linewidth.

Findings

Wavelength tunable from 1095 to 1115 nm

Linewidth adjustable from ~0.6 to over 2 nm

Provides a flexible tool for sensing and nonlinear applications

Abstract

Random fiber laser (RFL) based on random distributed feedback and Raman gain has earned much attention in recent years. In this presentation, we demonstrate a powerful linearly polarized RFL with spectral adjustment, in which the central wavelength and the linewidth of the spectrum can be tuned independently through a bandwidth-adjustable tunable optical filter (BA-TOF). As a result, the central wavelength can be continuously tuned from 1095 to 1115 nm, while the full width at half-maximum (FWHM) linewidth has a maximal tuning range from ~0.6 to more than 2 nm. This laser provides a flexible tool for scenes where the temporal coherence property accounts, such as coherent sensing/communication and nonlinear frequency conversion. To the best of our knowledge, this is the first demonstration of a high power linearly polarized RFL with both wavelength and linewidth tunability.