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作 者:吕毅 钟铭宸 姜维超 LüYi;Zhong Mingchen;Jiang Weichao(Institute of Quantum Precision Measurement,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)
机构地区:[1]深圳大学物理与光电工程学院量子精密测量研究所,广东深圳518060
出 处:《中国激光》2024年第23期1-9,共9页Chinese Journal of Lasers
基 金:国家自然科学基金(12074265);广东省基础与应用基础研究基金(2022A1515010329)。
摘 要:观察极紫外(XUV)场下的动态干涉现象需要较高的XUV光强,这就导致了实验上验证动态干涉现象的难度较高。引入红外(IR)辅助脉冲对电离电子进行调制,可以使实验上观察动态干涉所需的XUV光强显著降低。通过数值求解含时薛定谔方程(TDSE)的方法,研究了基态氢原子在IR+XUV双色激光场下的动态干涉现象。数值结果表明,当极紫外脉冲的峰位与红外脉冲矢势的极值位置重合时,光电子能谱上会出现多峰结构。系统分析了红外激光场的强度与紫外激光脉冲的长度对光电子能谱上的多峰结构的影响。同时进一步通过强场近似和鞍点分析,对多峰结构的物理起源进行了分析。强场近似的结果与鞍点计算的结果比较好地再现了数值TDSE计算中的多峰结构。Objective Due to the dependence of the dynamic interference phenomenon on the AC-Stark energy shift and atomic stabilization mechanism under extreme ultraviolet(XUV)fields,a higher XUV light intensity is necessary to observe the dynamic interference phenomenon of hydrogen atoms.This poses a challenge for experimental verification.Accordingly,in this work,infrared(IR)auxiliary pulses were introduced to modulate the ionized electrons,providing a solid theoretical basis for the experimental verification of dynamic interference phenomena.Methods Numerical solutions of the three-dimensional time-dependent Schrödinger equation(TDSE)were employed to compute the photoelectron energy spectrum of ground-state hydrogen atoms exposed to IR+XUV two-color laser pulses.The radial part of the wave function was discretized using the finite element discrete variable method(FEDVR),while the split-Lanczos method was utilized for the wave function propagation. By varying the pulse delay, IR pulse intensity, and full width at half maximum (FWHM) ofthe XUV pulse, we comprehensively analyzed their impact on the multi-peak structure observed in the photoelectron energy spectrum.Utilizing the strong field approximation (SFA) and saddle point approximation (SPA), we successfully replicated the multi-peakstructure observed in the TDSE calculations and examined the underlying physical mechanisms responsible for this intricatephenomenon.Results and Discussions Initially, for a short period of the infrared pulse, the dynamic interference phenomenon was mostpronounced when the peak position of the XUV pulse coincided with the extreme position of the infrared pulse. This caused a shift inthe peak position and variation in the number of peaks in the photoelectron energy spectrum (Fig. 2). Furthermore, an increase in theintensity of the infrared laser light led to a transition from a single peak to a multi-peak structure in the photoelectron energy spectrum,with simultaneous shifts in the peak positions and troughs. Consequently, a higher intensi
关 键 词:动态干涉 红外激光辅助 含时薛定谔方程 鞍点近似
分 类 号:O562[理学—原子与分子物理]
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