Abstract
Free electron lasers (FELs) are lasers which utilize the phenomenon of stimulated undulator radiation. Contrary to most lasers, the motion of an electron in the FEL may be described by classical mechanics and classical electrodynamics. Therefore, FELs belong to the family of vacuum electronic devices, such as traveling wave tubes or klystrons. In this article, basics of the low-gain FEL physics are discussed and general considerations are clarified through some examples.
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