Abstract
In this chapter I discuss a type of Free Electron Laser (FEL) which is based upon stimulated Raman (SR) Backscattering of a magnetostatic pump wave from a cold, dense, relativistic electron beam. Radiation from such a laser1 is of megawatt level and tuneable over the millimeter to far infrared spectrum (∼2mm – 100μ), using an electron beam of “modest” energy (0.5 – 2 MEV). One incentive to develop such a laser is that the production of intense far infrared coherent sources is difficult; conventional lasers are troubled by lack of energy storage, highly selective level excitation, and low efficiency—the latter usually following from a downconversion process which is driven by a powerful CO2 laser pump. Nevertheless, several far infrared lasers—at widely spaced intervals in the spectrum—have achieved noteworthy power output (∼1 MW); as a particular example, consider the CH3F system, which radiates at 496μ, and which is Raman-like,2 The Raman process is a nonlinear optical process requiring multi-photon absorption.
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Marshall, T.C. (1983). Free Electron Lasers Based Upon Stimulated Raman Backstattering: A Survey. In: Martellucci, S., Chester, A.N. (eds) Free Electron Lasers. Ettore Majorana International Science Series, vol 49. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3751-5_22
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