Huang Cheng, Zhong Mingmin, Wu Zhengmao
Opt Express. 2019 Mar 4;27(5):7616-7626. doi: 10.1364/OE.27.007616.
Nonsequential double ionization (NSDI) of Ar in co-rotating two-color circularly polarized (TCCP) laser fields is investigated with a three-dimensional classical ensemble model. Our numerical results indicate that co-rotating TCCP fields can induce NSDI by recollision process, while the yield is an order of magnitude lower than counter-rotating case. NSDI yield in co-rotating TCCP fields strongly depends on field ratio of the two colors and achieves its maximum at a ratio of 2.4. In co-rotating TCCP fields, the short recollision trajectory with traveling time smaller than one cycle is dominant. Moreover, the recollision time in co-rotating TCCP laser fields depends on the field ratio, which is mapped to the electron momentum distribution. This provides anavenue to obtain information about recollision time and access the subcycle dynamics of the recollision process.
利用三维经典系综模型研究了在同向旋转双色圆偏振（TCCP）激光场中氩的非顺序双电离（NSDI）。我们的数值结果表明，同向旋转的TCCP场可通过再碰撞过程诱导NSDI，但其产率比反向旋转情况低一个数量级。同向旋转TCCP场中的NSDI产率强烈依赖于两种颜色的场强比，在场强比为2.4时达到最大值。在同向旋转TCCP场中，传播时间小于一个周期的短再碰撞轨迹占主导。此外，同向旋转TCCP激光场中的再碰撞时间取决于场强比，这反映在电子动量分布上。这为获取有关再碰撞时间的信息以及了解再碰撞过程的亚周期动力学提供了一条途径。
