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Sapphire fiber Bragg grating sensor made using femtosecond laser radiation for ultrahigh temperature applications

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4 Author(s)
D. Grobnic ; Commun. Res. Centre Canada, Ottawa, Ont., Canada ; S. J. Mihailov ; C. W. Smelser ; Huimin Ding

We report for the first time the inscription of retro-reflective Bragg gratings in multimode crystalline sapphire fiber. The gratings were fabricated using 800-nm femtosecond laser radiation and a phase mask. The grating behavior was investigated up to 1500°C with no detectable reduction in the grating reflectivity or hysteresis in the Bragg resonance. Measurements of the change in the effective index of the fiber as a function of temperature are reported and the performance of the grating as a temperature sensor is evaluated.

Published in:

IEEE Photonics Technology Letters  (Volume:16 ,  Issue: 11 )