van Tilborg J, Schroeder C B, Filip C V, Tóth Cs, Geddes C G R, Fubiani G, Huber R, Kaindl R A, Esarey E, Leemans W P
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2006 Jan 13;96(1):014801. doi: 10.1103/PhysRevLett.96.014801. Epub 2006 Jan 4.
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 approximately = 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.
相对论激光-等离子体加速电子束团的时间分布已得到表征。在等离子体-真空边界处发射的太赫兹频率的相干渡越辐射，通过电光采样进行了测量。观测到的频率高达晶体检测极限4太赫兹。数据与理论之间的比较表明，结构短于约50飞秒（均方根）的束团会发射太赫兹辐射。该测量展示了激光-等离子体加速器的逐次稳定性以及束团与探测光束之间的飞秒同步。
