Laser-micromachined Fabry-Perot fiber-optic tip sensor for temperature-independent measurement of refractive index

Zeng-Ling Ran; Yun-Jiang Rao; Wei-Jun Liu; Xian Liao; Kin-Seng Chiang

doi:10.1117/12.785755

16 May 2008 Laser-micromachined Fabry-Perot fiber-optic tip sensor for temperature-independent measurement of refractive index

Zeng-Ling Ran, Yun-Jiang Rao, Wei-Jun Liu, Xian Liao, Kin-Seng Chiang

Author Affiliations +

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70041H (2008) https://doi.org/10.1117/12.785755
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

We propose and demonstrate a Fabry-Perot fiber-optic tip sensor for high-resolution refractive-index measurement. The sensor head consists of a short air cavity produced near the tip of a single-mode fiber by 157-nm laser micromachining. The external refractive index is determined from the maximum visibility of the interference fringes in the reflection spectrum of the fiber. This sensor provides temperature-independent measurement of practically any refractive index larger than that of air and offers a refractive-index resolution of ~4×10^-5 in its linear operating range. The experimental data agree well with the theoretical results.

Citation Download Citation

Zeng-Ling Ran, Yun-Jiang Rao, Wei-Jun Liu, Xian Liao, and Kin-Seng Chiang "Laser-micromachined Fabry-Perot fiber-optic tip sensor for temperature-independent measurement of refractive index", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70041H (16 May 2008); https://doi.org/10.1117/12.785755

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