Role of XUV Photons in Atomic High-Order Above-Threshold Ionization Processes in IR+XUV Two-Color Laser Fields  

作　　者：张奎 刘敏 王兵兵 郭迎春 严宗朝 陈京 柳晓军 

机构地区：[1]Laboratory of Optical Physics,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190 [2]Department of Physics,East China Normal University,Shanghai 200241 [3]Department of Physics,University of New Brunswick,Fredericton,New Brunswick,Canada [4]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071 [5]Center for Cold Atom Physics,Chinese Academy of Sciences,Wuhan 430071 [6]HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871 [7]Institute of Applied Physics and Computational Mathematics,Beijing 100088

出　　处：《Chinese Physics Letters》2017年第11期15-19,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11474348,61275128,11274050,11334009and 11425414;the NSERC of Canada;the Canadian Computing Facilities of SHARCnet and ACEnet;the National Basic Research Program of China under Grant No 2013CB922200

摘　　要：We investigate the above-threshold ionization of an atom in a combined infrared （IR） and extreme ultraviolet （XUV） two-color laser field and focus on the role of XUV field in the high-order above-threshold ionization （HATI） process. It is demonstrated that, in stark contrast to previous studies, the XUV laser may play a significant role in atomic HATI process, and in particular, the XUV laser can accelerate the ionized electron in a quantized way during the collision between the electron and its parent ion. This process cannot be explained by the elassical three-step model Our results indicate that the previously well-established concept that HATI is an elastic recollision process is broken down.We investigate the above-threshold ionization of an atom in a combined infrared （IR） and extreme ultraviolet （XUV） two-color laser field and focus on the role of XUV field in the high-order above-threshold ionization （HATI） process. It is demonstrated that, in stark contrast to previous studies, the XUV laser may play a significant role in atomic HATI process, and in particular, the XUV laser can accelerate the ionized electron in a quantized way during the collision between the electron and its parent ion. This process cannot be explained by the elassical three-step model Our results indicate that the previously well-established concept that HATI is an elastic recollision process is broken down.

关 键 词：ATI Role of XUV Photons in Atomic High-Order Above-Threshold Ionization Processes in IR+XUV Two-Color Laser Fields IR 

分 类 号：TN24[电子电信—物理电子学]