Abstract
The bunching phenomenon is the basic process occurring in a free-electron generator of coherent generation such as the Klystron in the mm-wave- length range or the free-electron laser (FEL) in the optical region. During interaction with the incident electromagnetic wave the electrons are progressively gathered into small packets separated by a length equal to its wavelength λL. Once the electrons are bunched there is a given phase relationship between them and the field of any wave which wavelength is an harmonic of λL. This is the source of the gain (electrons decelerated by the field) or of the absorption (electrons accelerated by the laser) mechanisms.1
© 1986 Optical Society of America
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