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Proceedings Paper

Increasing the spectral coverage of interferometric integrated optics: K/L and N-laser-written beam combiners
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Paper Abstract

Integrated optics (IO) has proven to be a competitive solution for beam combination in the context of astronomical interferometry (e.g. GRAVITY at the VLTI). However, conventional silica-based lithographic IO is limited to wavelengths shorter than 2.2μm. We report in this paper the progress on our attempt to extend the operation of IO to longer wavelengths. Previous work has demonstrated the suitability of chalcogenide devices in the MID-IR in the N band and monochromatically at 3.39 μm. Here, we continue this effort with the manufacturing of new laser written GLS IO as beam combiners designed for the astronomical L band and characterized interferometrically at 3.39 μm. In the era of multi-telescope interferometers, we present a promising solution to strengthen the potential of IO for new wavelength ranges.

Paper Details

Date Published: 4 August 2016
PDF: 7 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990719 (4 August 2016);
Show Author Affiliations
Jan Tepper, Univ. zu Köln (Germany)
Romina Diener, Friedrich-Schiller-Univ. Jena (Germany)
Lucas Labadie, Univ. zu Köln (Germany)
Stefano Minardi, Friedrich-Schiller-Univ. Jena (Germany)
Leibniz-Institut für Astrophysik Potsdam (Germany)
Balaji Muthusubramanian, Univ. zu Köln (Germany)
Jörg-Uwe Pott, Max Planck Institut für Astronomie (Germany)
Stefan Nolte, Friedrich-Schiller-Univ. Jena (Germany)
Alexander Arriola, Macquarie Univ. (Australia)
Gillian Madden, Heriot-Watt Univ. (United Kingdom)
Debaditya Choudhury, Heriot-Watt Univ. (United Kingdom)
William N. MacPherson, Heriot-Watt Univ. (United Kingdom)
Robert R. Thomson, Heriot-Watt Univ. (United Kingdom)

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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