Above-Threshold Ionization of Xenon by Chirped Intense Laser Pulses  

作　　者：王传亮 孙仁平 陈永菊 龚成 赖炫扬 康会鹏 全威 柳晓军 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 [2]University of Chinese Academy of Sciences, Beijing 100090

出　　处：《Chinese Physics Letters》2014年第6期86-89,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant Nos 2013CB922201 and 2011CB808102, and the National Natural Science Foundation of China under Grant Nos 11174330, 11204356 and 11334009.

摘　　要：We experimentally investigate above-threshold ionization of xenon subject to chirped intense laser pulses. While for few-cycle laser pulses free of chirp, the Freeman resonance narrow peaks in the photoelectron spectra become strongly suppressed, they will re-emerge for laser pulses with a certain chirp. Moreover, the position of the resonant peaks exhibits a strong dependence on the direction of the chirp. The experimental features can be understood by a two-step ionization process; that is, a multi-photon excitation plus subsequent ionization process.We experimentally investigate above-threshold ionization of xenon subject to chirped intense laser pulses. While for few-cycle laser pulses free of chirp, the Freeman resonance narrow peaks in the photoelectron spectra become strongly suppressed, they will re-emerge for laser pulses with a certain chirp. Moreover, the position of the resonant peaks exhibits a strong dependence on the direction of the chirp. The experimental features can be understood by a two-step ionization process; that is, a multi-photon excitation plus subsequent ionization process.

分 类 号：O432.1[机械工程—光学工程] TN241[理学—光学]