9 May 2018 Diameter and tensile strain measurements of optical nanofibers using Brillouin reflectometry
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Abstract
We demonstrate a simple and efficient technique that allows for a complete characterization of silica-based tapered optical fibers with sub-wavelength diameters ranging from 0.5 μm to 1.2 μm. The technique is based on Brillouin reflectometry using a single-ended heterodyne detection. It has a high precision sensitivity down to 1% owing to the strong dependence of the Brillouin spectrum on the taper diameter. We further investigate the tensile strain dependence of the Brillouin spectrum for an optical microfiber up to 5% of elongation. The results show strong dependences of several Brillouin resonances with different strain coefficients ranging from 290 MHz/% to 410 MHz/% with a specific nonlinear deviation at high strain. Those results therefore show that optical micro and nanofibers could find potential application for sensitive strain optical sensing.
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Adrien Godet, Abdoulaye Ndao, Vincent Pêcheur, Sylvie Lebrun, Gilles Pauliat, Thibaut Sylvestre, Jean-Charles Beugnot, Kien Phan Huy, "Diameter and tensile strain measurements of optical nanofibers using Brillouin reflectometry ", Proc. SPIE 10681, Micro-Structured and Specialty Optical Fibres V, 106810K (9 May 2018); doi: 10.1117/12.2306838; https://doi.org/10.1117/12.2306838
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