Evidence of ultrashort electron bunches in laser-plasma interactions at relativistic intensities
Evidence of ultrashort electron bunches in laser-plasma interactions at relativistic intensities
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DOI：
10.1103/physrevlett.91.105001
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发表时间：
2003-09-05
影响因子：
8.6
通讯作者：
Cowan, TE
中科院分区：
文献类型：
--
作者：
Baton, SD;Santos, JJ;Cowan, TE
用相对论强度的激光束辐照厚固体靶，在靶的背面观察到激光的二次谐波（2 Ω（0））。这种发射是由激光脉冲在靶前加速短电子束来解释的，这些短电子束被激光的周期（或半个周期）分开。当到达靶的后侧时，这些电子聚束发射2 Ω（0）的相干跃迁辐射。观测结果表明，在我们的条件下，转移到这些电子束团的激光能量的最小分数是1%的数量级。
The second harmonic of the laser light (2omega(0)) is observed on the rear side of thick solid targets irradiated by a laser beam at relativistic intensities. This emission is explained by the acceleration by the laser pulse in front of the target of short bunches of electrons separated by the period (or half the period) of the laser light. When reaching the rear side of the target, these electron bunches emit coherent transition radiation at 2omega(0). The observations indicate that, in our conditions, the minimum fraction of the laser energy transferred to these electron bunches is of the order of 1%.