Two-color laser-ionization injection.
Two-color laser-ionization injection.
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DOI：
10.1103/physrevlett.112.125001
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
L. Yu;E. Esarey;C. Schroeder;J. Vay;C. Benedetti;C. Geddes;Min Chen;W. Leemans
中科院分区：
文献类型：
--
作者：
L. Yu;E. Esarey;C. Schroeder;J. Vay;C. Benedetti;C. Geddes;Min Chen;W. Leemans
提出了一种在激光等离子体加速器中用两种不同颜色的激光产生飞秒、超低发射度(∼10-8mrad)电子束的方法。长波长泵浦脉冲具有大的质量动量和小的峰值电场，在不完全电离高Z气体的情况下激发尾迹。短波长注入脉冲，具有较小的有质动力和较大的峰值电场，相对于泵浦激光同向传播和延迟，在捕获尾迹阶段电离剩余束缚电子的一部分，产生在尾迹中加速的电子束。
A method is proposed to generate femtosecond, ultralow emittance (∼10-8 m rad), electron beams in a laser-plasma accelerator using two lasers of different colors. A long-wavelength pump pulse, with a large ponderomotive force and small peak electric field, excites a wake without fully ionizing a high-Z gas. A short-wavelength injection pulse, with a small ponderomotive force and large peak electric field, copropagating and delayed with respect to the pump laser, ionizes a fraction of the remaining bound electrons at a trapping wake phase, generating an electron beam that is accelerated in the wake.