Orthogonal Bragg gratings excited by single-mode reflection peaks in multi-mode no-core fibers inscribed with a femtosecond laser for vector bend sensing.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-03-15 DOI:10.1364/OL.553908

Tianxin Duan, Xingyong Li, Rongsheng Liu, Ruohui Wang, Fengyi Chen, Xueguang Qiao

引用次数: 0

Abstract

In this Letter, we propose the use of a femtosecond laser (FL) plane-by-plane (Pl-b-Pl) method to achieve narrowband single-mode reflection peak excitation directly in multi-mode no-core fibers (NCFs). The effects of different grating offsets on grating reflectivity were verified. We inscribed orthogonal fiber Bragg gratings with an offset distance of 15 μm in multi-mode no-core fibers, and the bending sensitivities of the two gratings can reach -2.79 and -2.93 dB/m^-1. This structure can be used as a two-dimensional vector bending sensor, especially for detecting very small bends.

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.