光学学报, 2013, 33 (6): 0602001, 网络出版: 2013-04-23   

少光周期的椭圆偏振激光脉冲驱动的氙原子非次序双电离

Nonsequential Double Ionization of Xe Atoms by Elliptically Polarized Few-Cycle Laser Pulses
作者单位
信阳师范学院物理电子工程学院, 河南 信阳 464000
摘要
利用经典系综模型,研究了少光周期的椭圆偏振激光脉冲驱动下的Xe原子非次序双电离(NSDI),使用的激光强度为2.5×1014 W/cm2,波长为780 nm。计算结果显示,在不同的载波包络相位(CEP)下,NSDI中得到的末态关联电子对沿激光偏振平面长轴方向的动量谱主要分布在一、三象限,呈现出强烈的正关联行为。关联电子对末态动量分布于一、三象限的总数量之比随CEP呈现先减小后增大的趋势。轨迹分析表明,在激光脉冲驱动下,NSDI是由于再碰撞而发生的,并且此过程以直接碰撞电离机制为主;另外,计算结果显示,再碰撞时刻对应的激光场相位强烈地依赖于CEP。
Abstract
With the classical ensemble model, the nonsequential double ionization (NSDI) of Xe atoms is investigated by the elliptically polarized few-cycle laser pulses at the laser intensity of 2.5×1014 W/cm2 and the laser wavelength of 780 nm. The results show that the momentum spectra of the final-state correlated electron pairs from NSDI along the long axis of the polarization plane are mainly distributed in the first and third quadrants, showing strongly correlated behavior at the various carrier-envelop phases (CEPs). The rate of the total number for the final-state correlated electron pairs whose momentum spectra are distributed in the first and third quadrants shows decrease firstly then increase as CEP decreases. By analyzing the trajectories, the events of NSDI are due to the recollision at this laser pulse and the processes of NSDI are dominated by (e, 2e) ionization. In addition, the laser phase at the recollision also strongly depends on CEP.
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余本海, 李盈傧, 李方涛. 少光周期的椭圆偏振激光脉冲驱动的氙原子非次序双电离[J]. 光学学报, 2013, 33(6): 0602001. Yu Benhai, Li Yingbin, Li Fangtao. Nonsequential Double Ionization of Xe Atoms by Elliptically Polarized Few-Cycle Laser Pulses[J]. Acta Optica Sinica, 2013, 33(6): 0602001.

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