Author(s): Lv, B (Lv, Bing); Zhang, WT (Zhang, Wentao); Huang, WZ (Huang, Wenzhu); Li, F (Li, Fang); Li, YQ (Li, Yongqian)

Source: SENSORS Volume: 22 Issue: 20 Article Number: 7882 DOI: 10.3390/s22207882 Published: OCT 2022

Abstract: A stabilized narrow-linewidth random fiber laser for strain detection, based on a three-grating ring (TGR) resonator and half-open-cavity structure, is proposed and investigated experimentally. The half-open-cavity structure proved to provide double optical gain of erbium-doped fiber, which was beneficial to increase the photon lifetime as well as further narrow the linewidth. Meanwhile, the stability and frequency noise of narrow lasing output was improved by suppressing the competition-induced undesired residual random lasing modes with the TGR resonator. The TGR resonator is composed of a double-cavity fiber Bragg grating Fabry-Perot (FBG-FP) interferometer, a section of single-mode fiber, and a circulator. The specially designed double-cavity FBG-FP interferometer embedded in the TGR resonator acted as the strain-sensing element and improved the resolution of the dynamic strain. A stable ultra-narrow linewidth of about 205 Hz was obtained. The frequency noise was reduced to about 2 Hz/root Hz. A high dynamic strain measuring resolution of 35 femto-strain (f epsilon)/root Hz was achieved.

Accession Number: WOS:000875943000001

PubMed ID: 36298233

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Zhang, Wentao                  0000-0003-4869-6564

eISSN: 1424-8220

Full Text: https://www.mdpi.com/1424-8220/22/20/7882