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24 November 2023 Femtosecond laser inscribed Bragg grating in hollow suspended-core fiber for refractive index sensing
Yan Liu, Shan Gao, Jing Yang, Jinhui Shi, Zheng Zhu, Chunying Guan
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Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129353L (2023) https://doi.org/10.1117/12.3007781
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China
Abstract
The fiber Bragg grating (FBG) was written in hollow suspended-core fiber (HSCF) using femtosecond laser point-bypoint technology. The HSCF based-FBG has a higher refractive index (RI) sensitivity to liquid in the air hole because the core of HSCF is completely exposed to air. In the RI range of 1.35~1.45, the reflection peak of the FBG moves toward the longer wavelength with the increase of the external RI. The wavelength shift of FBG is greater for the higher RI, which means that the HSCF-FBG has a higher sensitivity for the high RI environment. The RI sensitivity of the HSCF-FBG is 14.24 nm /RIU in the range of 1.42~1.44. The axial strain sensitivity of the sensor is 1.02 pm /με in the range of 0~900 με, and the temperature sensitivity is 10.22 pm /℃ in the range of 30~150 ℃. The HSCF-FBG RI sensor has higher sensitivity and lower temperature and strain crosstalk, therefore, proposed HSCF-FBG has prospective applications in biological detection, medical and health fields.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Yan Liu, Shan Gao, Jing Yang, Jinhui Shi, Zheng Zhu, and Chunying Guan "Femtosecond laser inscribed Bragg grating in hollow suspended-core fiber for refractive index sensing", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129353L (24 November 2023); https://doi.org/10.1117/12.3007781
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KEYWORDS
Fiber Bragg gratings
Femtosecond phenomena
Optical fibers
Sensors
Refractive index
Single mode fibers
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