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Proceedings Paper

Ultrafast laser inscribed integrated waveguide components for L-band interferometry
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Paper 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.

Paper Details

Date Published: 24 July 2014
PDF: 7 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91462L (24 July 2014); doi: 10.1117/12.2056494
Show Author Affiliations
A. Arriola , Heriot-Watt Univ. (United Kingdom)
S. Mukherjee, Heriot-Watt Univ. (United Kingdom)
Debaditya Choudhury, Heriot-Watt Univ. (United Kingdom)
L. Labadie, Univ. zu Köln (Germany)
R. R. Thomson, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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