Far-infrared, Waveguide and Distributed-feedback Gas Lasers

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Abstract
A survey is given of the history and the development of far-infrared and waveguide gas lasers. These lasers were the first to bridge the power gap between the thermal infrared and the microwave region, giving new impetus to spectrometry of gases, condensed matter and astronomical objects, as well as to plasma diagnostics. The basic types of far-infrared gas lasers are reviewed: electrically and transversely excited lasers, optically pumped lasers, waveguide lasers, distributed-feedback and helical-feedback lasers.