Controlling the Orbital Alignment in Atoms Using Cross-Circularly Polarized Extreme Ultraviolet Wave Packets
Controlling the Orbital Alignment in Atoms Using Cross-Circularly Polarized Extreme Ultraviolet Wave Packets
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DOI：
10.1103/physrevlett.123.233401
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发表时间：
2019-12-03
影响因子：
8.6
通讯作者：
Katoh, M.
中科院分区：
文献类型：
--
作者：
Kaneyasu, T.;Hikosaka, Y.;Katoh, M.
我们报告了使用成对的 10 周期极紫外波包，这些波包的间距由阿秒控制，由穿过串联波荡器的电子束内的各个相对论电子发射。基于圆偏振时间相干控制技术，我们成功地控制了氦原子光激发中的激发态排列，并通过观察荧光产率随阿秒控制延迟时间的振荡而得到验证。我们的工作证明了波荡器辐射在生成适合阿秒相干控制的纵向相干波包方面的潜力，这种应用迄今为止一直隐藏在由一堆电子发射的辐射脉冲的非相干性质中。
We report on the use of pairs of 10-cycle extreme ultraviolet wave packets with attosecond-controlled spacing emitted by individual relativistic electrons within an electron bunch passing through a tandem undulator. Based on the temporal coherent control technique with circular polarization, we succeeded in controlling the excited state alignment in the photoexcitation of helium atoms, which we verified through the observation of oscillation in fluorescence yield depending on the attosecond-controlled delay time. Our work demonstrates the potential of undulator radiation for the generation of longitudinally coherent wave packets suitable for attosecond coherent control, an application which has hitherto been hidden in the incoherent nature of the radiation pulse emitted by a bunch of electrons.