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Full characterization of superradiant pulses generated from a free-electron laser oscillator
Heishun Zen1, Ryoichi Hajima2, Hideaki Ohgaki3
1Institute of Advanced Energy, Kyoto University, Gokasho Uji, Kyoto, 611-0011, Japan. zen@iae.kyoto-u.ac.jp.
Abstract:
The detailed structure of superradiant pulses generated from a free-electron laser (FEL) oscillator was experimentally revealed for the first time. Owing to the phase retrieval with a combination of linear and nonlinear autocorrelation measurements, we successfully reconstructed the temporal waveform of an FEL pulse including its phase variation. The waveform clearly exhibits the features of a superradiant pulse, the main pulse followed by a train of sub-pulses with π-phase jumps, reflecting the physics of light-matter resonant interaction. From numerical simulations, the train of sub-pulses was found to originate from repeated formation and deformation of microbunches accompanied with a temporal slippage of the electrons and light field, a process quite different from coherent many-body Rabi oscillations observed in superradiance from atomic systems.
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