The single and double ionization of helium in intense 2 ω : ω bicircular laser fields is analyzed with a classical ensemble method. A high-performance computational cluster is utilized to generate high-resolution data and to probe low-rate events. It is found that both counter- and co-rotating fields support rescattering and non-sequential double ionization (NSDI). The effects of scattering off of the ionic core are evident in the single-ionization energy spectra, and the role of the Coulomb potential is clearly visible in the electron momentum distributions. The dynamics of the double ionization processes are investigated by analyzing ionization phase, electron energy and momenta, and rescattering timing. For corotating fields, rescattering is only possible for ionization near the field minimum, placing limits on the efficiency of NSDI. For counterrotating fields, the electron trajectories that contribute to rescattering are found to fall into only three categories (...

中文翻译：

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强双圆激光场中氦的单电离和双电离

用经典的集成方法分析了在2ω：ω双圆强激光场中氦的单电离和双电离。高性能计算群集用于生成高分辨率数据并探查低速率事件。发现反向旋转和同向旋转都支持散射和非顺序双电离（NSDI）。在单电离能谱中，离子核的散射效应很明显，而库仑势的作用在电子动量分布中清晰可见。通过分析电离相，电子能量和动量以及散射时间，研究了双电离过程的动力学。对于同向旋转场，仅在接近最小场的情况下电离才可能发生重散射，从而限制了NSDI的效率。