啁啾激光调控谐波截止能量及强度的研究

发布时间：2018-01-06 14:32

本文关键词：啁啾激光调控谐波截止能量及强度的研究　出处：《激光技术》2017年05期 　论文类型：期刊论文

【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 radiation process, the theoretical analysis of the cut-off energy and intensity of the harmonic radiation by chirped laser is carried out by solving the 3D Schrodinger equation numerically. The laser envelope diagram is analyzed. The electron ionization probability and harmonic radiation time-frequency analysis diagram are given, and the reasons of harmonic cut-off energy extension and harmonic intensity enhancement are given. The results show that under the negative chirped field. The intensity near the harmonic cut-off energy is increased by one order of magnitude compared with the non-chirped parameter. When the semi-periodic laser field is introduced, the harmonic cut-off energy can be effectively extended. A 46 as pulse can be obtained by adding the harmonics on the harmonic spectrum. The intensity of the pulse is one order of magnitude higher than that of the pulse without chirp parameter. This study is helpful for regulating the harmonic radiation process and the output of the attosecond pulse.
【作者单位】：辽宁工业大学化学与环境工程学院;辽宁工业大学理学院;吉林大学原子与分子物理研究所;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;
【基金】：国家自然科学基金资助项目(11504151) 辽宁省博士科研启动基金资助项目(201501123) 辽宁省教育厅基金资助项目(L2014242;JL201615405)
【分类号】：TN241
【正文快照】： 引言激光诱导高次谐波(high-order harmonic genera-tion,HHG)是强激光物理领域中最重要的现象之一。由于其在制备极紫外(extreme ultraviolet,EUV)以及X射线光源中有巨大的应用价值,过去20年中人们已对高次谐波进行了大量研究[1-4]。一般来说,激光与原子相互作用产生高次谐波

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