arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.6400physics.opticsphysics.chem-phphysics.ins-det
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全光三维电子脉冲压缩

All-optical three-dimensional electron pulse compression

Liang Jie Wong, Byron Freelon, Timm Rohwer, Nuh Gedik, Steven G. Johnson

摘要:

提出了一种全光三维电子脉冲压缩方案,利用厄米-高斯光学模在电子脉冲的静止坐标系中形成三维光阱。我们表明,光学入射角的正确选择是必要的最佳压缩。我们得到的任意阶厄米高斯自由空间模式赋予的净脉冲的解析表达式。虽然我们专注于电子,我们的理论适用于任何带电粒子和任何粒子的非零极化率在瑞利政权。我们验证了我们的理论数值使用精确的解麦克斯韦方程组的一阶厄米高斯光束,演示单电子脉冲压缩因子的$>10^{2}$在纵向和横向尺寸与实验上可实现的光脉冲。所提出的方案是有用的单电子和多电子脉冲压缩的超快电子成像,并作为一种手段,规避聚焦超短电子脉冲时,在磁透镜的时间失真。

英文摘要:

We propose an all-optical, three-dimensional electron pulse compression scheme in which Hermite-Gaussian optical modes are used to fashion a three-dimensional optical trap in the electron pulse's rest frame. We show that the correct choices of optical incidence angles are necessary for optimal compression. We obtain analytical expressions for the net impulse imparted by Hermite-Gaussian free-space modes of arbitrary order. Although we focus on electrons, our theory applies to any charged particle and any particle with non-zero polarizability in the Rayleigh regime. We verify our theory numerically using exact solutions to Maxwell's equations for first-order Hermite-Gaussian beams, demonstrating single-electron pulse compression factors of $>10^{2}$ in both longitudinal and transverse dimensions with experimentally realizable optical pulses. The proposed scheme is useful in ultrafast electron imaging for both single- and multi-electron pulse compression, and as a means of circumventing temporal distortions in magnetic lenses when focusing ultrashort electron pulses.

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