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Proceedings Paper

An open-cavity fiber Fabry-Perot interferometer fabricated by femtosecond laser micromachining for refractive index sensing
Author(s): Yueying Liu; Zhenguo Jing; Ang Li; Qiang Liu; Peng Song; Rui Li; Wei Peng
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Paper Abstract

We propose and demonstrate an open-cavity fiber extrinsic Fabry-Perot (FP) interferometer (EFPI), fabricated by using 800 nm femtosecond (fs) laser micromachining, for refractive index (RI) measurement. The sensor probe consists of two single-mode fiber (SMF) and a notched hollow-core fiber (HCF) fused together to form an all-silica structure of SMFHCF-SMF. The open micro-cavity is formed by removing part of the HCF in the center of its surface by fs laser micromachining technology, allowing liquid or gaseous sample to flow in. Such a sensor can provide an extremely highprecision RI measurement of 10-6 RIU (refractive index unit) and the sensitivity can reach up to 4×105 nm/RIU within the range between 1.355 and 1.374.

Paper Details

Date Published: 20 December 2019
PDF: 5 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120902 (20 December 2019); doi: 10.1117/12.2541465
Show Author Affiliations
Yueying Liu, Dalian Univ. of Technology (China)
Zhenguo Jing, Dalian Univ. of Technology (China)
Ang Li, Dalian Univ. of Technology (China)
Qiang Liu, Dalian Univ. of Technology (China)
Peng Song, Dalian Univ. of Technology (China)
Rui Li, Dalian Univ. of Technology (China)
Wei Peng, Dalian Univ. of Technology (China)

Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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