Abstract
The nonstationary dynamics of the free-electron laser oscillator with a low- Q cavity and a broad feedback frequency bandwidth is studied. A method for accounting for the feedback frequency dispersion within the framework of the spatio-temporal approach is proposed. It is shown that broadband dispersion changes the dynamics of the laser excitation, even when its bandwidth is large compared with the amplification bandwidth. Because of the reduction of the number of competing longitudinal modes, the transient time is significantly shortened. Moreover, the current threshold of stability of the single-frequency generation is considerably enlarged.
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