Detectors for infrared heterodyne mixing and detection

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Detectors, Mixing Circuits, Optical Heterodyning, Photovoltaic Effect, Signal Detection, Hot Electrons, Infrared Astronomy, Photoconductors, Semiconductor Devices

Scientific paper

The three different types of transitions which lead to photoconductivity are related to intrinsic photoconductivity, extrinsic photoconductivity, and the photoconductivity which occurs when radiation is absorbed by electrons already in the conduction band. Extrinsic photoconductors are considered in more detail, taking into account general material properties, electrical circuit properties, the performance of extrinsic germanium detectors, and extrinsic photoconductivity beyond 150 micrometers. Photovoltaic detectors are discussed along with pyroelectric detectors, Schottky diodes, and thin film metal bolometers.

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