Advances in broadband-integrated optic beam combiners for mid-IR astronomical interferometers

Jan Tepper, Romina Diener, Lucas Labadie, Stefano Minardi, Robert R. Thomson, Stefan Nolte

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


Photonic technology has pushed the limits of astronomy ever more in recent years. Especially, integrated optics (IO) has led to new standards in accuracy and stability in the eld of astronomical interferometry where several beams need to be coherently and simultaneously combined. We follow and extend the IO concept by writing mid-IR waveguides in gallium lanthanum sul de (GLS) using Ultrafast Laser Writing (ULI). Here, we report on the monochromatic and broadband interferometric capabilities in the mid-IR of such combiners. Finally, we outline the way to a ber-fed IO 4-telescope instrument for next-generation astronomical interferometers.

Original languageEnglish
Title of host publicationProceedings of the SPIE
Subtitle of host publicationPhotonic Instrumentation Engineering IV
EditorsYakov G. Soskind, Craig Olson
Number of pages6
ISBN (Electronic)9781510606616
Publication statusPublished - 7 Apr 2017
EventPhotonic Instrumentation Engineering IV - San Francisco, United States
Duration: 31 Jan 20172 Feb 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)1996-756X
ISSN (Electronic)0277-786X


ConferencePhotonic Instrumentation Engineering IV
Country/TerritoryUnited States
CitySan Francisco


  • 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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