PFC/JA-87-28 Generation of Short Pulses of Coherent Electromagnetic Radiation in a Free-Electron Laser Amplifier
نویسنده
چکیده
Theoretical and experimental studies of the evolution of a frequency-chirped pulse under the influence of both phase and gain dispersive effects induced by the free-electron laser (FEL) interaction are presented. For the experimental parameters used (electron beam voltage V ~ 150 kV, wiggler periodicity i.. = 3.5 cm, gain 10 dB, input pulse width At 200 ns, frequency wo/2r i10 GHz and frequency chirp a/27r 5 MHz/ns), pulses of a few nanoseconds were generated after an interaction length of 2.30 m, in good agreement with theoretical expectations. * Present address THOMSON-CSF, 2 rue Latscobre, BP 23, 78140 V61izvVillacoublay. France and Laboratoire PMI, Ecole Polytechnique, 91128 Palaiseau Cedex, France 1
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