中文摘要：

通过数值求解一维含时薛定谔方程，本文研究了组合脉冲与氢原子模型相互作用的高次谐波谱，组合脉冲由基频钛宝石激光和它的二次谐波构成．研究发现，当两束脉冲之间的相对相位取值不同时，谐波谱的截止位置呈现较大差异．对此，采用半经典的“三步”模型给出了合理的分析．本文的数值结果表明，尽管双色谐波谱的结构复杂，截止频率不能用一个简单的公式表示，但通过“三步”模型计算同样能准确预言出截止频率．

英文摘要：

We numerically calculate the high-order harmonic generation （HHG） power spectra from a one-dimensional model atom irradiated by linearly polarized bichromatic laser pulses composed of a fundamental Ti.sapphire and its second harmonic laser. It is found that, the cutoff position of the harmonic spectra take on obvious difference when the relative phases between two pulses are set as different value. As to this character, the reasonable explanations by the semiclassical ＂three-step＂ model are presented. Also, according to the semicalssical ＂three-step＂ model the cut-off frequencies of the bichromatic pulse HHG spectra could be exactly predicted.