All-in-one 4-telescope beam combination with a zig-zag array of waveguides

Romina Diener; Stefano Minardi; Jan Tepper; Stefan Nolte; Lucas Labadie

doi:10.1117/12.2232290

4 August 2016 All-in-one 4-telescope beam combination with a zig-zag array of waveguides

Romina Diener, Stefano Minardi, Jan Tepper, Stefan Nolte, Lucas Labadie

Proceedings Volume 9907, Optical and Infrared Interferometry and Imaging V; 990731 (2016) https://doi.org/10.1117/12.2232290
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

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.

Citation Download Citation

Romina Diener, Stefano Minardi, Jan Tepper, Stefan Nolte, and 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); https://doi.org/10.1117/12.2232290

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