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

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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.
Original languageEnglish
Article numbere17185
Number of pages8
JournalHeliyon
Volume9
Issue number6
DOIs
Publication statusPublished - 11 Jun 2023
Externally publishedYes

Keywords

  • Eccentric fiber Bragg gratings
  • Femtosecond laser
  • High temperature
  • Sensor
  • Strain

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