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本文利用三维经典系综模型研究了平行偏振三色场中He原子的非次序双电离. 利用强度相同的1600 nm和800 nm脉冲组成驱动场, 低强度的400 nm脉冲作为控制场. 研究结果表明, 第一次返回碰撞轨道、奇数次返回碰撞轨道(不含第一次返回碰撞)和偶数次返回碰撞轨道释放的电子对和离子分别处在电子关联动量谱和离子动量谱上的不同区域. 通过改变控制场的相位, 可以很好地控制不同返回次数碰撞轨道在双电离中的占比, 进而实现对电子动量分布和离子动量分布的控制. 另外, 多次返回碰撞导致的双电离以碰撞电离机制为主, 而第一次返回碰撞导致的双电离以碰撞激发电离机制为主, 所以通过改变控制场的相位也能实现对双电离机制的调控.Nonsequential double ionization (NSDI) of He atoms in a parallel polarized three-color field is investigated with a three-dimensional classical ensemble model. The driving field is composed by 1600 nm and 800 nm laser pulses with equal intensity. A weak 400 nm laser pulse is used as the controlling field. The results indicate that the electron pairs and ions from the first returning recollision (FRR) trajectories, the odd-returning recollision (ORR) trajectories (excluding FRR) and the even-returning recollision (ERR) trajectories are located at different regions separated well each other in the correlated electron momentum distribution and ion momentum distribution. The electron pairs from FRR trajectories mainly distribute around the origin, and those electron pairs from ORR and ERR trajectories respectively cluster in the first quadrant and the third quadrant. With the increase of the phase of the controlling field, the proportion of FRR trajectories in NSDI first increases and then decreases, and the proportions of those trajectories with the returning number more than one first decrease and then increase. It results in that with the increase of the phase of the controlling field, the anticorrelated emissions first increase and then decrease and correspondingly the ion momentum distribution evolves from a double-hump to a triple-hump and then to a double-hump structure. Moreover, NSDI from multiple-returning recollision trajectories mainly proceed by recollision-induced direct ionization (RDI) mechanism, and NSDI from the FRR trajectories mainly occur by recollision-induced excitation with subsequent ionization (RESI) mechanism. Thus the dominant NSDI ionization mechanism can be also controlled by changing the phase of the controlling field.
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Keywords:
- nonsequential double ionization /
- parallel polarized three-color field /
- recollision /
- ultrafast dynamics
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