Ultrafast laser inscribed integrated waveguide components for L-band interferometry

A. Arriola, Sebabrata Mukherjee, Debaditya Choudhury, L. Labadie, R. R. Thomson

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

3 Citations (Scopus)


In this paper we report the fabrication and mid-infrared characterization (λ = 3.39 μm) of evanescent field directional couplers. These devices were fabricated using the femtosecond laser direct-writing technique in commercially available Gallium Lanthanum Sulphide (GLS) glass substrates. We demonstrate that the power splitting ratios of the devices can be controlled by adjusting the length of the interaction section between the waveguides, and consequently we demonstrate power splitting ratios of between 8% and 99% for 3.39 μm light. We anticipate that mid-IR beam integrated-optic beam combination instruments based on this technology will be key for future mid-infrared astronomical interferometry, particularly for nulling interferometry and earth-like exoplanet imaging.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
ISBN (Print)9780819496140
Publication statusPublished - 2014
EventOptical and Infrared Interferometry IV - Montreal, United Kingdom
Duration: 23 Jun 201427 Jun 2014


ConferenceOptical and Infrared Interferometry IV
Country/TerritoryUnited Kingdom


  • astronomy
  • chalcogenide
  • direct-writing
  • evanescent field couplers
  • femtosecond
  • interferometry
  • mid-infrared


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