激光技术, 2017, 41 (5): 708, 网络出版: 2017-09-21   

啁啾激光调控谐波截止能量及强度的研究

Study on harmonic cutoff energy and intensity under the control of chirped laser
刘航 1,2李义 2姚震 2,3冯立强 2,4
作者单位
1 辽宁工业大学 化学与环境工程学院, 锦州 121001
2 辽宁工业大学 理学院, 锦州 121001
3 吉林大学 原子与分子物理研究所, 长春 130012
4 中国科学院 大连化学物理研究所 分子反应动力学国家重点实验室, 大连 116023
摘要
为了调控谐波辐射过程, 采用数值求解3维薛定谔方程的方法, 进行了啁啾激光对调控谐波辐射截止能量及强度的理论分析。通过分析激光包络图、电子电离几率、谐波辐射时频分析图, 给出了谐波截止能量延伸以及谐波强度增强的原因。结果表明, 在负向啁啾场下, 谐波截止能量附近的强度与无啁啾参量相比增强了1个数量级; 当引入半周期调控激光场后, 谐波截止能量得到有效延伸; 适当叠加谐波谱上的谐波, 可获得一个46as的脉冲; 该脉冲强度比无啁啾参量下获得的脉冲强1个数量级。该研究对调控谐波的辐射过程及阿秒脉冲的输出是有帮助的。
Abstract
In order to control the harmonic emission process, the chirp pulse control on the harmonic cutoff and the harmonic intensity was theoretically investigated by using 3-D Schrdinger equation. Laser profiles, ionization probabilities, time-frequency analyses of the harmonic spectra were shown to explain the extension and the enhancement of harmonic spectra. The results show that the intensity of the harmonic cutoff region in the presence of the down-chirp pulse is enhanced by one order of magnitude in comparison with the chirp-free pulse case. By properly adding a half-cycle controlling pulse, the harmonic cutoff is remarkably extended. By superposing a properly selected harmonics, a 46as pulse can be produced. The intensity of the generated pulse is one order of magnitude higher than that from the chirp-free case. The investigation is helpful to control the harmonic emission and to produce the attosecond pulse.
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刘航, 李义, 姚震, 冯立强. 啁啾激光调控谐波截止能量及强度的研究[J]. 激光技术, 2017, 41(5): 708. LIU Hang, LI Yi, YAO Zhen, FENG Liqiang. Study on harmonic cutoff energy and intensity under the control of chirped laser[J]. Laser Technology, 2017, 41(5): 708.

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