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 Neil MacPherson, Robert R. Thomson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationOptical and Infrared Interferometry and Imaging V
EditorsFabien Malbet, Michelle J. Creech-Eakman, Peter G. Tuthill
ISBN (Electronic)9781510601949
ISBN (Print)9781510601932
Publication statusPublished - 4 Aug 2016
EventOptical and Infrared Interferometry and Imaging V - Edinburgh, United Kingdom
Duration: 27 Jun 20161 Jul 2016

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferenceOptical and Infrared Interferometry and Imaging V
Country/TerritoryUnited Kingdom


  • Beam Combination
  • Infrared
  • Integrated Optics
  • Interferometry
  • Laser Writing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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