Broadband micro-Michelson interferometer with multi-optical-path beating using a sphered-end hollow fiber |
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Authors: | Chen Nan-Kuang Lu Kuan-Yi Shy Jow-Tsong Lin Chinlon |
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Institution: | Department of Electro-Optical Engineering, National United University, Miaoli, Taiwan 360. nankuang@gmail.com |
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Abstract: | We demonstrate a high-sensitivity broadband (1250-1650 nm) fiber micro-Michelson interferometer using a single-mode fiber end-spliced with a sphered-end hollow-core fiber. The hollow core is slightly smaller than the solid core of a single-mode fiber, so the fractional power of the core mode is converted into cladding modes. The excited cladding modes propagate at distinct optical paths along the hollow-core fiber and have individual foci outside the spherical lens. The reflected core mode, generated at the solid core-air interface, and the reflected cladding modes, generated at external material, interfere with each other to produce beating in the interference signals. |
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