@inproceedings{e3dbda79874f418cba905aad4d49a6a2,
title = "Ultrafast laser inscribed integrated waveguide components for L-band interferometry",
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.",
keywords = "astronomy, chalcogenide, direct-writing, evanescent field couplers, femtosecond, interferometry, mid-infrared",
author = "A. Arriola and S. Mukherjee and D. Choudhury and L. Labadie and Thomson, {R. R.}",
year = "2014",
doi = "10.1117/12.2056494",
language = "English",
volume = "9146",
series = "Proceedings of SPIE",
publisher = "SPIE",
pages = "91462L--1--91462L--7",
editor = "Rajagopal, {Jayadev K.} and Creech-Eakman, {Michelle J.} and Fabien Malbet",
booktitle = "Optical and infrared interferometry IV",
address = "United States",
note = "Optical and Infrared Interferometry IV ; Conference date: 23-06-2014 Through 27-06-2014",
}