Ultrafast laser inscribed integrated waveguide components for L-band interferometry

A. Arriola, S. Mukherjee, D. Choudhury, L. Labadie, R. R. Thomson

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

2 Citations (Scopus)

Abstract

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 publicationOptical and infrared interferometry IV
EditorsJayadev K. Rajagopal, Michelle J. Creech-Eakman, Fabien Malbet
Place of PublicationWashington, DC
PublisherSPIE
Pages91462L-1-91462L-7
Number of pages7
Volume9146
ISBN (Electronic)9780819496140
DOIs
Publication statusPublished - 2014
Externally publishedYes
EventOptical and Infrared Interferometry IV - Montreal, Canada
Duration: 23 Jun 201427 Jun 2014

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9146
ISSN (Electronic)0277-786X

Other

OtherOptical and Infrared Interferometry IV
CountryCanada
CityMontreal
Period23/06/1427/06/14

Keywords

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

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