An economical, coherent, and widely tunable source does not exist spanning the far-infrared electromagnetic spectral range of 50–1000μm in wavelength. The Čerenkov free-electron laser (CFEL) is a promising candidate. This report describes an experimental investigation of a compact CFEL driven by a high-quality low-energy electron beam. Čerenkov emission and strong gain but remarkably low output coupling were observed.
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Owens et al. (2005) studied this question.
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