A high-temperature resistant fiber Bragg grating (FBG) with pronounced cladding modes is fabricated using a simple, fast, and flexible point-by-point femtosecond laser inscription. Cladding modes of different orders exhibit various sensitivities to changes in refractive index of the surrounding medium and temperature, while the Bragg wavelength is only dependent on the ambient temperature. By combining the resonance of cladding modes and the Bragg resonance, measurement of variations of temperature and surrounding refractive index can be achieved. Survivability of the cladding modes and the core mode in the fabricated FBG at elevated temperatures up to 1000°C is demonstrated.
C. Zhu et al., "High-Temperature Stable FBGs Fabricated by a Point-By-Point Femtosecond Laser Inscription for Multi-Parameter Sensing," OSA Continuum, vol. 4, no. 2, pp. 355-363, Optical Society of America (OSA), Feb 2021.
The definitive version is available at https://doi.org/10.1364/OSAC.415685
Electrical and Computer Engineering
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15 Feb 2021