Free-Electron Laser

  • Karl F. Renk
Part of the Graduate Texts in Physics book series (GTP)


In a free-electron laser (FEL), free electrons of a velocity near the speed of light are passing through a periodic magnetic field. Due to the Lorentz force, the electrons perform oscillations (free-electron oscillations) with displacements transverse to the propagation direction. Stimulated emission of radiation by the oscillating electrons is the origin of free-electron laser radiation. The frequency of the radiation increases quadratically with the electron energy. Frequency tuning over a large frequency range is possible by changing the electron energy; the range of the electron energy is determined by the particle accelerator that produces an external electron beam used to operate a free-electron laser.


Transverse Velocity Gain Coefficient Transverse Oscillation Electron Oscillation High Frequency Field 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Institut für Angewandte PhysikUniversität RegensburgRegensburgGermany

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