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

Jan Tepper; Romina Diener; Lucas Labadie; Stefano Minardi; Balaji Muthusubramanian; Jörg-Uwe Pott; Stefan Nolte; Alexander Arriola; Gillian Madden; Debaditya Choudhury; William N. MacPherson; Robert R. Thomson

doi:10.1117/12.2231394

4 August 2016 Increasing the spectral coverage of interferometric integrated optics: K/L and N-laser-written beam combiners

Jan Tepper, Romina Diener, Lucas Labadie, Stefano Minardi, Balaji Muthusubramanian, Jörg-Uwe Pott, Stefan Nolte, Alexander Arriola, Gillian Madden, Debaditya Choudhury, William N. MacPherson, Robert R. Thomson

Author Affiliations +

Proceedings Volume 9907, Optical and Infrared Interferometry and Imaging V; 990719 (2016) https://doi.org/10.1117/12.2231394
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

Jan Tepper, Romina Diener, Lucas Labadie, Stefano Minardi, Balaji Muthusubramanian, Jörg-Uwe Pott, Stefan Nolte, Alexander Arriola, Gillian Madden, Debaditya Choudhury, William N. MacPherson, and Robert R. Thomson "Increasing the spectral coverage of interferometric integrated optics: K/L and N-laser-written beam combiners", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990719 (4 August 2016); https://doi.org/10.1117/12.2231394

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