A review of the development and the present state of the art of waveguides for submillimeter-wave lasers is presented. Theoretical and experimental aspects of waveguides for longitudinally and transversely excited as well as for optically pumped lasers are discussed. This is followed by a comment on investigations of periodic waveguide structures for distributed feeback submillimeter-wave lasers.
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F. K. Kneubühl (1977) studied this question.