Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers

Abstract

Photonic integrated circuits are established as the technique of choice for a number of astronomical processing functions due to their compactness, high level of integration, low losses, and stability. Temperature control, mechanical vibration and acoustic noise become controllable for such a device enabling much more complex processing than can realistically be considered with bulk optics. To date the benefits have mainly been at wavelengths around 1550 nm but in the important Mid-Infrared region, standard photonic chips absorb light strongly. Chalcogenide glasses are well known for their transparency to beyond 10000 nm, and the first results from coupler devices intended for use in an interferometric nuller for exoplanetary observation in the Mid-Infrared L band (3800-4200 nm) are presented here showing that suitable performance can be obtained both theoretically and experimentally for the first fabricated devices operating at 4000 nm.

in Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990730 (August 4, 2016)

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Cited by in corpus (4)

• First on-sky demonstration of an integrated-photonic nulling-interferometer: The GLINT instrument
• Integrated optics prototype beam combiner for long baseline interferometry in the L and M bands
• Astrophotonics: astronomy and modern optics
• Photonic mid-infrared nulling for exoplanet detection on a planar chalcogenide platform