激光脉宽对椭偏光驱动的原子次序双电离的影响

利用经典模型,研究了激光脉宽对椭偏光驱动的Ar原子次序双电离(SDI)的影响.结果发现,二价离子动量分布强烈地依赖于激光脉宽.随激光脉宽增加,离子动量分布从二带结构变为四带结构,然后又变为六带结构.向后分析双电离轨迹既显示了椭偏光驱动的原子次序双电离中的亚周期电子出射现象,又表明带状结构随激光脉宽的演化取决于第二个电子电离时间随激光脉宽的变化.

Influence of Pulse Duration on Atomic Sequential Double Ionization by Elliptical Laser Pulses

By a classical ensemble method,the influence of pulse duration on sequential double ionization(SDI) of Ar atoms driven by elliptically polarized laser pulse was investigated.The results showed that the doubly charged ion momentum distribution depends strongly on pulse duration.As the pulse duration increases,the ion momentum distribution changes from two-band to four-band structure,and finally to the six-band structure.Back analysis of double ionization trajectories not only manifested the subcycle electron emission in sequential double ionization by elliptically polarized laser pulses,but also showed that the variation of the band structure was originated from the pulse duration dependence of the ionization time of the second electron.