Title :
Sapphire fiber Bragg grating sensor made using femtosecond laser radiation for ultrahigh temperature applications
Author :
Grobnic, Dan ; Mihailov, Stephen J. ; Smelser, Christopher W. ; Ding, Huimin
Author_Institution :
Commun. Res. Centre Canada, Ottawa, Ont., Canada
Abstract :
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.
Keywords :
Bragg gratings; fibre optic sensors; high-speed optical techniques; hysteresis; laser materials processing; masks; refractive index; sapphire; temperature sensors; 1500 degC; 800 nm; Al2O3; Bragg resonance; effective index change; femtosecond laser radiation; grating reflectivity; hysteresis; phase mask; sapphire fiber Bragg grating sensor; temperature sensor; Bragg gratings; Fiber gratings; Fiber lasers; Optical fiber devices; Optical fiber sensors; Optical fiber testing; Resonance; Sensor arrays; Temperature sensors; Ultrafast optics;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.834920
