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

Volume

16

Issue

11

fYear

2004

Firstpage

2505

Lastpage

2507

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2004.834920

Filename

1344082