High-temperature and stress response behavior of femtosecond laser pulses inscribed eccentric fiber Bragg gratings

Peng Jiang; Qiang Xu; Rui Zhang; Haiping Bai; Kang Li; Nigel Copner; Yongkang Gong

doi:10.1016/j.heliyon.2023.e17185

High-temperature and stress response behavior of femtosecond laser pulses inscribed eccentric fiber Bragg gratings

Heliyon. 2023 Jun 9;9(6):e17185. doi: 10.1016/j.heliyon.2023.e17185. eCollection 2023 Jun.

Authors

Peng Jiang^{1

2

3}, Qiang Xu^{1

2

3}, Rui Zhang¹, Haiping Bai⁴, Kang Li⁵, Nigel Copner⁵, Yongkang Gong⁶

Affiliations

¹ College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China.
² Engineering Technology Research Center for Ultrafast Optics and Advanced Material of Baoji, Baoji, 721016, China.
³ Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz Technology, Baoji, 721016, China.
⁴ College of Science, Inner Mongolia Agricultural University, Hohhot, 010018, China.
⁵ School of Engineering, University of South Wales, Cardiff, CF37 1DL, United Kingdom.
⁶ School of Physics and Astronomy, Cardiff University, CF24 3AA, United Kingdom.

Abstract

Eccentric fiber Bragg grating (EFBG) is inscribed in standard communication single-mode fiber using femtosecond laser pulses, and the temperature and strain sensing characteristics are experimentally demonstrated and analyzed. The EFBG exhibits strong thermal stability and good robustness in high-temperature measurement up to 1000 °C, and undergoes different thermal sensitivities during Bragg peak and the strong resonance coupled cladding spectral comb. The temperature sensitivity linearly increases with respect to the effective index of the resonant modes. Such a situation also occurs in axial strain measurement. These characteristics are of high interest for multiparametric sensing at high temperatures.

Keywords: Eccentric fiber Bragg gratings; Femtosecond laser; High temperature; Sensor; Strain.