Millimeter-wave orotron oscillation - Part I: Theory

Physical principles of operation of the orotton, a Smith-Purcell free-electron laser in the millimeter and submillimeter wavelength regions, are described. Electron bunching in this device occurs when the electron beam interacts with an evanescent component of the electromagnetic wave that propagate...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1981-08, Vol.17 (8), p.1333-1340
Main Authors: Leavitt, R., Wortman, D., Dropkin, H.
Format: Article
Language:English
Subjects:
Electromagnetic diffraction
Electromagnetic propagation
Electromagnetic scattering
Electron beams
Free electron lasers
Laser theory
Millimeter wave devices
Millimeter wave propagation
Optical propagation
Submillimeter wave propagation
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Summary:Physical principles of operation of the orotton, a Smith-Purcell free-electron laser in the millimeter and submillimeter wavelength regions, are described. Electron bunching in this device occurs when the electron beam interacts with an evanescent component of the electromagnetic wave that propagates along the metallic diffraction grating of the device with a phase velocity neatly equal to the electron velocity; this bunching produces coherent radiation. The equations of motion are linearized, and the starting current and electronic tuning characteristics of the device are calculated in closed form. Numerical calculations of the electron efficiency are described.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.1981.1071306