Ma Xiaomeng, Zhou Yueming, Chen Yinbo, Li Min, Li Yang, Zhang Qingbin, Lu Peixiang
Opt Express. 2019 Feb 4;27(3):1825-1837. doi: 10.1364/OE.27.001825.
With the semiclassical ensemble model, we systematically investigate the correlated electron dynamics in strong-field nonsequential double ionization (NSDI) by the counter-rotating circularly polarized two-color (CPTC) laser pulses. Our results show that the angular distributions of the electrons in NSDI sensitively depend on the intensity ratio of the CPTC laser fields. At the small ratio, the electron pairs emit with a relative angle of about 120°, and this angle shifts to 40° as the ratio increases and finally it exhibits a wide range distribution as the intensity ratio further increases. Back analysis of the NSDI trajectories shows that this behavior results from the relative-intensity-dependence of the release time of the electron pairs in the CPTC laser fields. The release times of the electron pairs are directly mapped to the angular distribution. Our results indicate that the emission times of the correlated electrons in NSDI can be controlled with the CPTC laser fields.
利用半经典系综模型，我们系统地研究了反向旋转圆偏振双色（CPTC）激光脉冲作用下强场非顺序双电离（NSDI）中的关联电子动力学。我们的结果表明，NSDI中电子的角分布敏感地依赖于CPTC激光场的强度比。在小强度比时，电子对以约120°的相对角度发射，随着强度比增加，这个角度移至40°，当强度比进一步增加时，最终呈现出宽范围分布。对NSDI轨迹的反向分析表明，这种行为源于CPTC激光场中电子对释放时间的相对强度依赖性。电子对的释放时间直接映射到角分布上。我们的结果表明，NSDI中关联电子的发射时间可以通过CPTC激光场来控制。
