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Photonic integrated circuits are established as the technique of choice for anumber of astronomical processing functions due to their compactness, highlevel of integration, low losses, and stability. Temperature control,mechanical vibration and acoustic noise become controllable for such a deviceenabling much more complex processing than can realistically be considered withbulk optics. To date the benefits have mainly been at wavelengths around 1550nm but in the important Mid-Infrared region, standard photonic chips absorblight strongly. Chalcogenide glasses are well known for their transparency tobeyond 10000 nm, and the first results from coupler devices intended for use inan interferometric nuller for exoplanetary observation in the Mid-Infrared Lband (3800-4200 nm) are presented here showing that suitable performance can beobtained both theoretically and experimentally for the first fabricated devicesoperating at 4000 nm.

Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers