反旋双色圆偏振激光场下Ar原子非次序双电离研究

摘要

Nonsequential double ionization of Ar in a counterrotating two-color circularly polarized laser field is investigated using classical ensemble method.The double ionization probability versus laser intensity shows the prominent "knee" structure, which indicates obvious electron correlation phenomenon.The ratio between the second harmonic laser pulse and the fundamental laser pulse can enable us to enhance or suppress the ionization yields.The tendency of double ionization changes with the ratio is general at different laser intensities.Furthermore, with analyzing the recollision time and excitation ionization time, we show the control of different ionization channels by changing the intensities of counterrotating two-color circularly polarized laser fields.%应用经典系综方法模拟了反旋双色圆偏振激光场下Ar原子非次序双电离过程.双电离概率随激光强度变化曲线呈现出"knee"结构,表明了明显的电子关联特征.通过调节倍频与基频激光场的场强比可以实现对双电离的增强或抑制以及最优化.在"knee"结构区域的不同场强下,这种调控机制具有相似性.通过分析重碰撞和激发电离的时间特征,进一步讨论了反旋双色圆偏振激光场的强度对不同电离通道的控制规律.