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One of the major challenges of mid-infrared astronomical heterodyneinterferometry is its sensitivity limitations. Detectors capable of handlingseveral 10 GHz bandwidths have been identified as key building blocks of futureinstruments. Intersubband detectors based on heterostructures have recentlydemonstrated their ability to provide such performances. In this work wecharacterize a Quantum Well Infrared Photodetector in terms of noise, dynamicrange and bandwidth in a non-interferometric heterodyne set-up. We discuss thepossibility to use them on astronomical systems to measure the beating betweenthe local oscillator and the astronomical signal.

Characterization of Mid-Infrared Intersubband Detectors for Astronomical Heterodyne Interferometry