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激光脉宽对谐波频移和振幅强度的影响
Pulse duration effect on frequency and amplitude modulation of harmonics
摘要点击 15  全文点击 5  投稿时间:2017-05-14  修订日期:2017-06-07
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DOI编号  
中文关键词   高次谐波  激光脉宽  谐波频移  谐波强度调制
英文关键词   High-order harmonic generation  pulse duration  frequency modulation of harmonics  amplitude modulation of harmonics
基金项目   国家自然科学基金
作者单位E-mail
刘航 辽宁工业大学化学与环境工程学院 liuhang20@126.com 
刘辉 辽宁工业大学理学院  
冯立强 辽宁工业大学理学院 lqfeng1101@126.com 
中文摘要
    数值研究了激光脉宽对H2+和T2+谐波辐射的影响。计算结果表明,(i) 对于谐波频移现象:在少周期激光场下,H2+和T2+谐波辐射呈现红移。随着激光脉宽增大,H2+谐波辐射呈现蓝移;T2+谐波辐射红移减弱。(ii) 对于谐波振幅强度:H2+和T2+谐波辐射强度会随着激光脉宽增大而增强。但是,在少周期激光场下,H2+谐波截至能量附近的强度要大于T2+。在多周期激光场下,T2+谐波截至能量附近的强度要大于H2+。
英文摘要
    Laser pulse duration effect on the high-order harmonic generation from H2+ and T2+ has been theoretically investigated. The results show that (i) in the aspect of the frequency modulation of harmonics, the red-shifts of the harmonics from H2+ and T2+ can be found in the few-cycle pulse. As the pulse duration increases, the harmonics from H2+ present the blue-shifts and the red-shifts of the harmonics from T2+ are decreased. (ii) In the aspect of the amplitude modulation of harmonics, the intensities of the harmonics from H2+ and T2+ can be enhanced as the pulse duration increases. However, for the case of the few-cycle pulse, the intensities of the harmonic cutoffs from H2+ are higher than those from T2+. For the case of the multi-cycle pulse, the intensities of the harmonic cutoffs from T2+ are higher than those from H2+.

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