Photonics-based mid-infrared interferometry

4-year results of the ALSI project and future prospects

Lucas Labadie*, Stefano Minardi, Jan Tepper, Romina DIener, Balaji Muthusubramanian, Jörg Uwe Pott, Stefan Nolte, Simon Gross, Alexander Arriola, Michael J. Withford

*Corresponding author for this work

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

1 Citation (Scopus)
55 Downloads (Pure)


In this contribution, we review the results of the ALSI project (Advanced Laser-writing for Stellar Interferometry), aimed at assessing the potential of ultrafast laser writing to fabricate mid-infared integrated optics (IO) devices with performance compatible with an implementation in real interferometric instruments like Hi5 or PFI. Waveguides for the L, L' and M bands with moderate propagation losses were manufactured in Gallium Lanthanum Sulfide and ZBLAN glasses and used to develop photonic building blocks as well as a full mid-IR 4-telescope beam combiner. We discuss the advantages and disadvantages of the tested combiners and discuss a possible roadmap for the continuation of this work.

Original languageEnglish
Title of host publicationOptical and Infrared Interferometry and Imaging VI
EditorsMichelle J. Creech-Eakman, Peter G. Tuthill, Antoine Mérand
Place of PublicationBellingham, Washington
Number of pages16
ISBN (Electronic)9781510619562
ISBN (Print)9781510619555
Publication statusPublished - 9 Jul 2018
Event2018 Optical and Infrared Interferometry and Imaging VI - Austin, United States
Duration: 11 Jun 201815 Jun 2018

Publication series

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


Conference2018 Optical and Infrared Interferometry and Imaging VI
CountryUnited States

Bibliographical note

Copyright 2018 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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