Laser & Optoelectronics Progress, Volume. 61, Issue 5, 0506009(2024)
Dual-Peak Resonance Long-Period Fiber Grating Refractive Index Sensor Based on CO2 Laser Technology
A dual-peak resonance long-period fiber grating (LPFG) based on CO2 laser technology is proposed to investigate a highly sensitive refractive index sensor. First, dual-peak resonance LPFGs with grating periods of 196 and 73 μm are fabricated in conventional single-mode fiber and 80 μm bend-insensitive single-mode fiber, respectively,using a CO2 laser after etching cladding. This demonstrates the possibility of fabricating an LPFG on a single-mode fiber with a shorter grating period using CO2 laser micromachining technology. Dual-peak resonance LPFGs with grating periods of 110 and 115 μm are directly fabricated in two 80 μm single-mode fibers using a CO2 laser. The results show that the dual-peak resonance LPFGs fabricated in two 80 μm thin single-mode fibers exhibit advantages of deep attenuation loss, low loss, and high refractive index sensitivity. Based on its excellent performance, the dual-peak resonance LPFG based on CO2 laser technology is a prospective sensor applicable to fields such as biological, chemical, and environmental parameter detection. In addition, a simple-operation low-cost method for fabricating dual-peak resonance LPFGs is proposed.
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Shuang Zhao, Chao Du, Qiuyu Wang, Bin Jia, Li Zhang, Liqin Cui, Xiao Deng. Dual-Peak Resonance Long-Period Fiber Grating Refractive Index Sensor Based on CO2 Laser Technology[J]. Laser & Optoelectronics Progress, 2024, 61(5): 0506009
Category: Fiber Optics and Optical Communications
Received: Nov. 30, 2022
Accepted: Dec. 12, 2022
Published Online: Mar. 12, 2024
The Author Email: Du Chao (duchao@tyut.edu.cn), Deng Xiao (dengxiao@tyut.edu.cn)