Tilborg, J. van and Schroeder, C. B. and Filip, C. V. and Tóth, Cs. and Geddes, C. G. R. and Fubiani, G. and Huber, Rupert and Kaindl, R. A. and Esarey, E. and Leemans, W. P.
Temporal Characterization of Femtosecond Laser-Plasma-Accelerated Electron Bunches Using Terahertz Radiation.
Physical Review Letters (PRL) 96 (1), 014801.
The temporal profile of relativistic laser-plasma-accelerated electron bunches has been characterized. Coherent transition radiation at THz frequencies, emitted at the plasma-vacuum boundary, was measured through electro-optic sampling. Frequencies up to the crystal detection limit of 4 THz were observed. Comparison between data and theory indicates that THz radiation from bunches with structure shorter than ≃50 fs (root-mean-square) is emitted. The measurement demonstrates both shot-to-shot stability of the laser-plasma accelerator and femtosecond synchronization between bunch and probe beam.