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This report is a primer introduction on the sources of coherent syncrotronradiation from FELs compared to conventional lasers. Even though the underlyingmechanisms are different, FELs can be considered a laser source to all effects.In fact FEL is based on the stimulated emission of virtual photons by arelativistic electron beam, passing through an undulator/wiggler, much likeconventional lasers exploit the stimulated emission by an atomic/molecularsystem on which a population inversion has been realized. FEL operation isillustrated by means of the usual set of parameters (gain, saturationintensity...) used to describe the functioning of conventional lasers.

Introduction to the Physics of Free Electron Laser and Comparison with Conventional Laser Sources