7 March 2014 Fiber inline Michelson interferometer fabricated by CO2 laser irradiation for refractive index sensing
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Abstract
A compact Michelson interferometer (MI) in a single-mode fiber (SMF) is successfully formed by CO2 laser irradiation to measure refractive index (RI) values. The fiber inline MI mainly consists of two parts: one is the waist region in fiber formed by CO2 laser irradiation and the other one is the fiber tip end facet with pure gold sputter coating. Based on the MI theory, the interference signal is generate between the core mode and the cladding mode excited by the core mode at the waist region. Reflective spectra at two different interference lengths of 5mm and 15mm are given and the calculated lengths based on theory are well verified. After the measurements of matching liquids with seven different refractive indices, the RI sensitivity of the MI sample is tested of -197.3±19.1nm/RIU (refractive index unit), which suggests well potential application in RI sensing.
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Hongbin Wu, Lei Yuan, Longjiang Zhao, Zhitao Cao, Peng Wang, "Fiber inline Michelson interferometer fabricated by CO2 laser irradiation for refractive index sensing", Proc. SPIE 8974, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics VII, 89741D (7 March 2014); doi: 10.1117/12.2040114; https://doi.org/10.1117/12.2040114
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