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The free-electron-laser synchronous harmonic generator—A high power source of submillimeter waves

Published online by Cambridge University Press:  09 March 2009

E. S. Cassedy
E. S. Cassedy
Affiliation:
Department of Electrical Engineering and Computer Sciences, Polytechnic University, Brooklyn, NY 11201
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Abstract

A harmonic generator of submillimeter wavelength radiation, operating on a relativistic electron beam, is proposed. The device is shown to operate on principles of parametric interactions, under the particular conditions of an electric-quadrupole pump field which is propagating synchronously with the electron beam. Using a fluid model, it is shown that a cascade of parametric sum and difference frequencies in the transverse beam modes should occur, with each harmonic component growing convectively along the beam. The physical effect, termed the “sonic condition”, has been observed previously on a non-relativistic device emitting output radiation in the UHF range. A realization for relativistic beams is proposed, using an FEL structure as the parametric pump, a closed waveguide synchronous pump region and an output coupling of the gyrotron type. Possible advantages over the present state-of-the-art for high-power submillimeter electron-beam devices are discussed.

Type
Research Article
Information
Laser and Particle Beams , Volume 5 , Issue 4 , November 1987 , pp. 659 - 674
Copyright
Copyright © Cambridge University Press 1987

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