4 August 2016 All-in-one 4-telescope beam combination with a zig-zag array of waveguides
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In this work we propose a new geometry of discrete beam combiners (DBC) for spectrally-resolved stellar interferometry which overcomes limitations of previous designs. The new beam combiner is based on an array of coupled waveguides arranged in zig-zag pattern. It has been numerically optimized for the combination of 4 telescopes and engineered to operate in the L-band. We manufactured a first sample by direct laser writing in Gallium Lanthanum Sulfide glass, a highly transmissive material in the mid-infrared (550 nm to 10 μm). Initial near-field characterization of the fabricated sample at a wavelength of 3.4 μm are encouraging, but highlighted the necessity of a better control of the polarization dispersion of individual waveguides, as well as induced stresses from manufacturing process.
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Romina Diener, Romina Diener, Stefano Minardi, Stefano Minardi, Jan Tepper, Jan Tepper, Stefan Nolte, Stefan Nolte, Lucas Labadie, Lucas Labadie, "All-in-one 4-telescope beam combination with a zig-zag array of waveguides", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990731 (4 August 2016); doi: 10.1117/12.2232290; https://doi.org/10.1117/12.2232290

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