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数值计算了线偏振的超短激光脉冲(脉冲持续时间为两个光学周期)与一维模型原子相互作用产生的高次谐波发射功率谱.研究表明,当载波相位发生变化时,超短脉冲谐波谱的截止频率也随之改变,而且在特定相位下,谐波谱出现了明显的双平台结构.对此,采用半经典的“三步”模型给出了合理解释,并利用小波时频分析方法证实“三步”模型可以准确预言超短脉冲谐波谱的截止频率.
The power spectrum of the harmonic emission generated by the interaction between the linearly polarized ultrashort laser pulse (the pulse duration of two optical periods) and the one-dimensional model atom is numerically calculated. The results show that when the carrier phase changes, the ultrashort pulse The cut-off frequency of the harmonic spectrum also changes, and under the specific phase, the harmonic spectrum shows obvious dual-platform structure. For this reason, the semi-classical “three steps” model is used to give a reasonable explanation. The wavelet time-frequency analysis proved that the “three-step” model can accurately predict the cut-off frequency of the ultra-short pulse harmonic spectrum.