Femtosecond Laser-Inscribed High-Order Bragg Gratings in Large-Diameter Sapphire Fibers for High-Temperature and Strain Sensing

被引：36
作者：
Chen, Chao [1 ]
Zhang, Xuan-Yu [2 ]
Yu, Yong-Sen [2 ]
Wei, Wei-Hua [2 ]
Guo, Qi [2 ]
Qin, Li [1 ]
Ning, Yong-Qiang [1 ]
Wang, Li-Jun [1 ]
Sun, Hong-Bo [2 ,3 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Jilin, Peoples R China
[2] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Jilin, Peoples R China
[3] Tsinghua Univ, Dept Precis Instrument, State Key Lab Precis Measurement & Instruments, Beijing 100084, Peoples R China
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2018年 / 36卷 / 16期
基金：
中国国家自然科学基金;
关键词：
Femtosecond (fs) laser; fiber Bragg gratings; optical fiber sensors; sapphire fiber; MULTIMODE OPTICAL-FIBERS; COMPOSITE STRUCTURES; SENSOR; INSCRIPTION; RADIATION; SPECTRA; SINGLE;
D O I：
10.1109/JLT.2018.2840699
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Aiming for structural health monitoring applications in harsh environments, a high-order sapphire fiber Bragg grating (HO-SFBG) written with a femtosecond (fs) laser in a large-diameter sapphire fiber is demonstrated. The radial refractive index modulation area induced by scanning exposure is greater than 60% of the fiber cross-section area. The large mode overlapping area leads to a transmission resonance strength of approximately 3.0 dB. As demonstrated by numerical simulations of mode excitation and multimode resonance, each mode resonance is significantly superposed when the coupling coefficient is above 0.0005. A study of the high temperature and strain sensing characteristics of the HO-SFBG shows that each high-order resonance has different response characteristics. This type of large-diameter SFBG has important application potential for high-temperature smart materials with embedded fiber sensors.
引用
收藏
页码：3302 / 3308
页数：7
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