Free Electron Lasers (FELs)
In the broad sense of the word, the term “Free Electron Laser”(FEL) implies a device the operation of which is based on the stimulated emission of undulator and/or Cherenkov radiation of relatively short wavelengths. However, Cherenkov mechanism, based on applying dielectric channels and diffraction lattices, is limited by the above–mentioned difficulties in slowing the wave velocity down to the velocity of the beam. The corresponding devices rather should be called the free electron masers.
KeywordsTransverse Velocity Free Electron Laser Beam Density Transverse Wave Number Space Charge Wave
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