单周期激光脉冲序列作用下H原子光电离率的不对称性

采用非微扰散射理论，分别研究了线偏振的单周期激光脉冲序列以及圆偏振的单周期激光脉冲序列作用下，H原子的光电离特性。对相反方向上的光电子的不对称性进行了研究，结果表明其不对称程度与载波－包络（CE）相位、激光强度及光电子的动能有关。线偏振时，最大电离率随CE相位变化，且不对称程度随CE相位的变化呈正弦曲线特性；圆偏振时，最大电离率是常数，不随CE相位变化，但不对称程度随CE相位的变化仍呈正弦曲线特性。

Asymmetry of the photoionization rate of H atoms by a sequence of one-cycle laser pulses

Using an unperturbated scattering theory, the characteristics of H atom photoionization are studied respectively by a linearly and by a circularly polarized one-cycle laser pulse sequence. The asymmetries for photoelectrons in two directions opposite to each other are investigated. It is found that the asymmetry degree varies with the carrier-envelope (CE) phase, laser intensity, as well as the kinetic energy of photoelectrons. For the linear polarization, the maximal ionization rate varies with the CE phase, and the asymmetry degree varies with the CE phase in a sine-like pattern. For the circular polarizaion, the maximal ionization rate keeps constant for various CE phases, but the variation of asymmetry degree is still in a sine-like variation pattern.