中文摘要：

在强场近似下,利用简单的近似波函数作为分子基态最高占据轨道的波函数,研究了N2分子在强激光场中产生高次谐波的特性,并将结果与用精确的分子波函数作为基态波函数得到的结果进行了比较.结果表明,采用这两种不同的分子基态波函数得到的高次谐波在分子轴与激光偏振方向间的夹角较小时符合得很好,而在夹角较大的情况下,两者的结果差异较大.通过分析不同波函数所给出的电子密度分布,给出了产生这种差异的原因.

英文摘要：

Based on the strong-field approximation, the characteristics of the high harmonic generation （HHG） of N2 molecule in intense laser field are investigated by using both simple and accurate wave functions as molecular highest occupied orbital wave function of the ground state. Comparing the results obtained by the simple wave function with ones obtained by the accurate wave function, it was shown that the intensity of HHG obtained by the simple molecular wave function is in agreement with ones of the accurate molecular wave function for small angles between the axis of molecule and the polarization direction of laser field, while for large angles, the calculated intensities are different. The difference is attributed to the different distributions of the electronic probability density in configuration space for the two molecular wave functions.