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Proceedings Paper

All-in-one 4-telescope beam combination with a zig-zag array of waveguides
Author(s): Romina Diener; Stefano Minardi; Jan Tepper; Stefan Nolte; Lucas Labadie
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Paper 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.

Paper Details

Date Published: 4 August 2016
PDF: 7 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990731 (4 August 2016); doi: 10.1117/12.2232290
Show Author Affiliations
Romina Diener, Friedrich-Schiller-Univ. Jena (Germany)
Stefano Minardi, Friedrich-Schiller-Univ. Jena (Germany)
Leibnitz-Institut für Astrophysik (Germany)
Jan Tepper, Univ. zu Köln (Germany)
Stefan Nolte, Friedrich-Schiller-Univ. Jena (Germany)
Lucas Labadie, Univ. zu Köln (Germany)

Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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