A random fiber laser with multiple bidirectional Rayleigh scattering provided by dual-ring sub-cavity structure

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-02-10 DOI:10.1016/j.rinp.2025.108151

Shaode Li , Wei He , Qiongyue Zhang , Xingpeng Fei

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引用次数: 0

Abstract

In this study, a simple and effective method for enhancing Rayleigh scattering (RS) intensity is proposed and experimentally validated, enabling stable output with exceptionally low-frequency noise across each wavelength channel of random fiber lasers (RFLs). The design employs two segments of single-mode fibers (SMFs) symmetrically arranged in dual-ring sub-cavity. This unique structural configuration facilitates multiple bidirectional RS interactions, providing sufficient random distributed feedback (R-DFB) for the laser system. Initially, random laser (RL) outputs at 1560 nm were achieved using both ring-cavity and single-ring sub-cavity structures. These systems exhibited frequency noise exceeding 1.21 Hz/√Hz and wavelength and output power fluctuations of 0.79 nm and 1.52 dB, respectively. Subsequently, the laser system was upgraded to a dual-ring sub-cavity configuration, and its output performance was re-evaluated. The experimental results show that the wavelength and output power fluctuations are reduced to 0.28 nm and 0.26 dB, respectively. Benefiting from the enhanced R-DFB and superior filtering properties of the dual-ring sub-cavity, the frequency noise of the lasing output decreased significantly to 0.03 Hz/√Hz, the lowest value reported to date. In addition, the importance of sufficient R-DFB for RFL is demonstrated by measuring frequency amplitude, output linewidth, and slope efficiency.

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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