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We present the laboratory characterisation of the first working, mid-infrared, integrated optics, 4-channel interferometric beam combiner based on the properties of two-dimensional arrays of evanescently coupled waveguides. Potential applications of the component to astronomy, biology and quantum optics are proposed and discussed.
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Romina Diener, Jan Tepper, Stefan Nolte, Lucas Labadie, Stefano Minardi, "Four-channel interferometry with a zig-zag array of mid-infrared integrated waveguides," Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI, 101061D (16 February 2017); https://doi.org/10.1117/12.2250597