从经典方程出发,采用克兰克-尼科尔森中心差分法对一维多原子分子离子与一维超短强激光场相互作用产生的高次谐波进行了数值模拟计算,发现激光场的初始相位对高次谐波辐射谱有明显影响;通过进一步研究,给出了初步解释。从而,可以通过调节适当的激光初始相位和选取适当的系统来改善高次谐波的相位匹配,产生清晰的高次谐波辐射谱。

Using Crank Nicolson algorithm, the high order harmonic generation from one dimension multi atom molecular ion in an ultra short laser field is calculated. It is found that the resolution of high order harmonics can be seriously affected by initial phase of laser field. A rudimental explanation is given. It can be applied to other theory or experimental study for improving phase matching or producing well defined high-order harmonics by properly adjusting of initial phase of laser field.