Abstract
Quantum theory is applied to interference of emission and absorption in a two-section Čerenkov free-electron laser (FEL). A scheme for absorption cancellation with enhanced gain, which resembles “lasing without inversion” in atomic systems, is proposed. This scheme is based on the adjustment of the phases of electrons and light by appropriate dispersion between the two sections. It enables FEL operation even with a broad electron momentum spread. Such a scheme is interesting in the context of FEL operation in the ultraviolet and X-ray regimes.
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