Interaction of electrons and pump fields at superluminal electron velocities

The paper discusses differences between the subluminal and superluminal mechanisms for producing laser radiation by the interaction of an electron beam, a pump field, and a medium. Numerical estimates, an analysis of coherence properties, and an investigation of the dynamic behavior of the frequency bands in an active medium show that under superluminal conditions this three-agent method will have significant potential advantages over the corresponding configurations without the pump field or without the dielectric. One such feature is the modulation of the field and the short-time intensity by harmonics of the beat frequency for the entire broadband superposition of carrier frequencies.