Applications of the josephson effects in the millimetre and submillimetre wavelength regions

The Josephson effects, which arise at a suitable junction between two pieces of superconducting material, have several applications at millimetre and submillimetre wavelengths. Devices based on the effects can be used as video detectors, harmonic mixers and frequency analysers, often with unique properties. These and other possible applications are described, and the current experimental situation using the `point contact¿ type of junction is outlined.