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Interaction of coherent electromagnetic waves with relativistic electrons in a medium

A Corrigendum to this article was published on 11 October 1974

Abstract

A MECHANISM is proposed here for producing coherent photons by the interaction in a medium of relativistic electrons (moving with velocity greater than the electromagnetic phase velocity in the medium) with coherent electromagnetic waves incident in the opposite direction. A new effect of potential use is exhibited; it is a consequence of two distinct physical phenomena acting synergistically to result in double-Doppler-shifted coherent waves contained within a Mach cone. Its applications include production of narrow band radiation at higher frequencies and wave numbers than are at present available from lasers, which has implications for holography and for improved pumping efficiency and production of narrow band submillimetre waves from microwaves, which has significance for communications.

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SCHNEIDER, S., SPITZER, R. Interaction of coherent electromagnetic waves with relativistic electrons in a medium. Nature 250, 643–645 (1974). https://doi.org/10.1038/250643a0

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