Odd electron wave packets from cycloidal ultrashort laser fields
Odd electron wave packets from cycloidal ultrashort laser fields
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DOI：
10.1038/s41467-019-08601-7
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发表时间：
2019-02
影响因子：
16.6
通讯作者：
S. Kerbstadt;K. Eickhoff;T. Bayer;M. Wollenhaupt
中科院分区：
文献类型：
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作者：
S. Kerbstadt;K. Eickhoff;T. Bayer;M. Wollenhaupt
具有摆线偏振轮廓的偏振定制的双色飞秒激光场已经成为相干控制量子过程的有力工具。我们提出了一种光学方案，通过结合先进的超连续谱脉冲整形和高分辨率光电子层析成像来创建和操纵具有任意旋转对称性的三维自由电子波包。在这里，我们使用载流子包络相位稳定、偏振定制的双色(3ω：4ω)反向和共旋飞秒激光脉冲，通过钠原子的多光子电离产生7倍旋转的对称和不对称光电子动量分布。为了阐明物理机制，我们通过改变光场参数来研究驱动场的对称性与所产生的电子波包之间的相互作用。我们的结果表明，电子波包的对称性并不完全由场的对称性决定，而是完全由不同角动量的态的多路径量子干涉来描述。
Polarization-tailored bichromatic femtosecond laser fields with cycloidal polarization profiles have emerged as a powerful tool for coherent control of quantum processes. We present an optical scheme to create and manipulate three-dimensional free electron wave packets with arbitrary rotational symmetry by combining advanced supercontinuum pulse shaping with high resolution photoelectron tomography. Here we use carrier-envelope phase-stable polarization-tailored bichromatic (3ω:4ω) counter- and corotating femtosecond laser pulses to generate 7-fold rotational symmetric and asymmetric photoelectron momentum distributions by multiphoton ionization of sodium atoms. To elucidate the physical mechanisms, we investigate the interplay between the symmetry properties of the driving field and the resulting electron wave packets by varying the optical field parameters. Our results show that the symmetry properties of electron wave packets are not fully determined by the field symmetry, but completely described by multipath quantum interference of states with different angular momenta.