Towards the development of mid-infrared integrated optics in the renewed context of high-contrast interferometry

Tarun Kumar Sharma, Lucas Labadie, Dominik Strixner, Simon Gross, Thomas Gretzinger, Sascha Quanz, Denis Defrère, Sanny Ahmed, Michael J. Withford

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Single-mode integrated optics is an increasingly employed technology in interferometric instruments to reach high-accuracy visibility and closure phases measurements. Here, we address the progress achieved in the area of mid-infrared integrated optics beam combiners beyond 2.5 μm fabricated in MIR chalcogenide glasses by ultrafast laser inscription. Thanks to the synergistic cooperation between the Universities of Cologne and Macquarie, we fabricated optimized asymmetric and multimode interference beam combiners and tested them around 4 μm. In contrast to our earlier works, we also focused on the high-contrast capabilities of these devices and measured levels of null depth. This may become relevant for future projects such as Hi5/VLTI or the space mission LIFE.

Original languageEnglish
Title of host publicationOptical and Infrared Interferometry and Imaging VII
EditorsPeter G. Tuthill, Antoine Mérand, Stephanie Sallum
Place of PublicationBellingham, Washington
Number of pages10
ISBN (Electronic)9781510636804
ISBN (Print)9781510636798
Publication statusPublished - 13 Dec 2020
EventOptical and Infrared Interferometry and Imaging VII 2020 - Virtual, Online, United States
Duration: 14 Dec 202022 Dec 2020

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical and Infrared Interferometry and Imaging VII 2020
Country/TerritoryUnited States
CityVirtual, Online

Bibliographical note

Copyright 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Astrophotonics
  • Integrated Optics
  • Long-baseline interferometry
  • Optical/infrared instrumentation


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