Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser

Pengfei Liu; Lan Jiang; Sumei Wang; Zhitao Cao; Peng Wang

doi:10.3788/COL201614.020602

Journals >Chinese Optics Letters >Volume 14 >Issue 2 >Page 020602 > Article

Chinese Optics Letters
Vol. 14, Issue 2, 020602 (2016)

Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser

Pengfei Liu, Lan Jiang, Sumei Wang^*, Zhitao Cao, and Peng Wang

Author Affiliations

Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

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DOI: 10.3788/COL201614.020602 Cite this Article Set citation alerts

Pengfei Liu, Lan Jiang, Sumei Wang, Zhitao Cao, Peng Wang. Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser[J]. Chinese Optics Letters, 2016, 14(2): 020602 Copy Citation Text

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Abstract

An optical fiber extrinsic Fabry–Perot interferometer (EFPI) is designed and fabricated for refractive index (RI) sensing. To test the RI of liquid, the following two different methods are adopted: the wavelength tracking method and the Fourier-transform white-light interferometry (FTWLI). The sensitivities of sensors with cavity lengths of 288.1 and 358.5 μm are 702.312 nm/RIU and 396.362 μm/RIU, respectively, by the two methods. Our work provides a new kind of RI sensor with the advantages of high sensitivity, mechanical robustness, and low cross sensitivity to temperature. Also, we provide a new method to deal with gold film with a femtosecond laser.