An open-cavity fiber Fabry-Perot interferometer fabricated by femtosecond laser micromachining for refractive index sensing

Yueying Liu; Zhenguo Jing; Ang Li; Qiang Liu; Peng Song; Rui Li; Wei Peng

doi:10.1117/12.2541465

20 December 2019 An open-cavity fiber Fabry-Perot interferometer fabricated by femtosecond laser micromachining for refractive index sensing

Yueying Liu, Zhenguo Jing, Ang Li, Qiang Liu, Peng Song, Rui Li, Wei Peng

Author Affiliations +

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 1120902 (2019) https://doi.org/10.1117/12.2541465
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

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.

Citation Download Citation

Yueying Liu, Zhenguo Jing, Ang Li, Qiang Liu, Peng Song, Rui Li, and Wei Peng "An open-cavity fiber Fabry-Perot interferometer fabricated by femtosecond laser micromachining for refractive index sensing", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120902 (20 December 2019); https://doi.org/10.1117/12.2541465

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