借助于分子刚性转子模型,利用数值方法求解了CO2分子在二束脉冲激光作用下的薛定谔方程,计算了CO2分子在总强度I=1.0×1014W/cm2固定激光脉冲作用下分子取向的变化行为。研究结果表明,在不同温度下当激光总强度固定时,将一束激光脉冲分成具有同样脉冲宽度的二束脉冲,当强度比为1/3时,都可以极大地提高CO2分子的取向程度;在不同温度下,通过调整第2束脉冲宽度,可以进一步提高CO2分子的取向程度。以上结果对实验中在不同温度下提高分子取向具有指导意义。

By solving time-dependent Schr¨o dinger equation numerically,field-free alignment of CO2 molecule induced by laser pulse with intensity 1×104W/cm2 is investigated.The results show that the alignment can be optimized by dividing the laser pulse into two-pulse of the same duration at different temperatures.The degree of alignment can be extremely raised with an intensity ratio 1/3.The alignment can be further enhanced by selecting the pulse duration of the second pulse at different temperatures,which is of great help to enhance the degree of alignment in the experiment.