量子光场驱动下氢原子强场电离的研究(特邀)  

Strong⁃Field Ionization of Hydrogen Atom Driven by Quantum Light(Invited)

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作  者:申博仁 毛亦嘉 何明睿 李洋 何峰 Shen Boren;Mao Yijia;He Mingrui;Li Yang;He Feng(Key Laboratory for Laser Plasmas(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Basic Courses,Naval University of Engineering,Wuhan 430033,Hubei,China)

机构地区:[1]上海交通大学物理与天文学院激光等离子体教育部重点实验室,上海200240 [2]海军工程大学基础部,湖北武汉430033

出  处:《光学学报》2024年第17期306-312,共7页Acta Optica Sinica

基  金:国家自然科学基金(12274294,12204545)。

摘  要:通过对三维含时薛定谔方程进行数值求解,深入探讨氢原子在量子光场驱动下的强场电离现象。着重考察光场的量子特性对光电子动量谱中干涉结构的影响。研究结果显示,在明亮真空压缩(BSV)态光场(即量子光)的作用下,相较于相干态光场(准经典光),光电子的阈上电离能谱呈现出更高的截止能量。此外,量子光场的光子统计效应对光电子的干涉产生了重要影响。在BSV态光场的驱动下,光电子周期内的干涉条纹被抹平,而周期间的干涉结构即阈上电离峰依然显著。值得注意的是,光电子的全息干涉结构即直接电离电子与前向再散射电子的干涉条纹仍然存在。Objective In the context of previous research in strong-field physics,the laser field has frequently been regarded as a classical field,largely overlooking the quantum effects of the field.The advent of specific quantum optical technologies has resulted in the emergence of quantum light sources that meet the requisite standards for strong-field physics.Consequently,there is a necessity to consider the quantum effects of the laser field.Recent studies have demonstrated that strong-field processes driven by quantum optical sources exhibit new phenomena.For example,high harmonic driven by squeezed state light is squeezed light.However,there are numerous phenomena related to strong-field physics under quantum optical drive remain unexplored,and significant gaps in our understanding of the quantum effects involved persist.This study examines the momentum distribution and energy spectrum of hydrogen atoms under coherent state light(quasi-classical light)and bright squeezed vacuum state light(quantum light lacking a classical counterpart),providing a comprehensive investigation of the phenomenon of above-threshold ionization.Methods In the interaction between atoms and quantum light,the density matrix of the atom-quantum light system satisfies the complete quantum time-dependent Schrödinger equation.The linear nature of the density matrix,as dictated by the Schrödinger equation,allows any quantum light field to be decomposed into a linear combination of coherent states.This decomposition is achieved by transforming the Schrödinger equation into a summation of solutions corresponding to coherent state light.Consequently,the solution of the density matrix is a non-coherent superposition of the solutions of the Schrödinger equation for coherent state light.By separately solving the Schrödinger equation for each coherent state,the Schrödinger equation for the density matrix of the atom-quantum light system can be indirectly obtained.This approach effectively employs numerical methods to explore the three-dimensional t

关 键 词:超快光学 量子光场 强场电离 光电子干涉 

分 类 号:O436[机械工程—光学工程]

 

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