Controlling electron recollision with combined linear and circular polarization

Controlling electron recollision with combined linear and circular polarization
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通过组合线偏振和圆偏振控制电子碰撞

DOI:
10.3389/fphy.2022.1004021
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发表时间:
2022-09
影响因子:
3.1
通讯作者:
Jing Chen
Jing Chen
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Shuai Ben;Yifan Han;Weifeng Yang;Weiwei Yu;Xiaolei Hao;Xiaohong Song;Weidong Li;Jing Chen

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通过三维半经典模拟,从理论上研究了线偏振激光和圆偏振激光复合场中Ar原子的非顺序双电离。通过将两个延时多周期激光脉冲部分重叠,构造出偏振椭圆度在连续光周期内缓慢增加的光波形。这种具有时变椭圆性的复合激光脉冲可以使原子隧穿电离,并通过不同的轨道引导第一个隧穿电子与第二个束缚电子重聚,其中重聚发生在第一个电离电子返回的不同时间。通过调整两个激光脉冲之间的延迟时间,可以控制双电离产率和不同返回时间下的回忆轨迹。不同延迟时间的时变椭圆性可以增强或抑制不同返回时间的概率。这项工作提供了一种在多周期激光场中在几个光周期甚至亚周期时间尺度上探索电子动力学的方案,而不必局限于近单周期激光脉冲。
We theoretically investigate the non-sequential double ionization of Ar atoms in the combined fields of linearly polarized laser and circularly polarized laser through 3D semiclassical simulations. By partially overlapping the two time-delayed multicycle laser pulses, we construct an optical waveform whose polarization ellipticity increase slowly for consecutive optical cycles. This composite laser pulses with the time-dependent ellipticity can tunnel-ionize atoms and steer the first tunneling electron to recollision with the second bound electron through different trajectories, in which the recollision occurs with different return times of the first ionized electron. Through tuning delay time between the two laser pulses, the double ionization yields and recollision trajectories with different return times can be controlled. The time-dependent ellipticity with different delay time can enhance or suppress the probability of different return times. This work provides a scheme exploring electron dynamics in few optical cycle or even subcycle time scale in a multicycle laser field without having to be limited to near-single-cycle laser pulses.
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