Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields  

作　　者：Guihua Li Hongqiang Xie Ziting Li Jinping Yao Wei Chu Ya Cheng 

机构地区：[1]School of Science, East China Jiaotong University [2]School of Science, East China University of Technology [3]State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences [4]School of Physics Science and Engineering, Tongji University

出　　处：《High Power Laser Science and Engineering》2017年第4期20-25,共6页高功率激光科学与工程（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2014CB921300);the National Natural Science Foundation of China (Nos. 11127901, 11134010, 61575211, 11304330, 11404357, 61405220, 61605227, and 61705034);the Shanghai ‘Yang Fan’ Program (Nos. 14YF1406100 and 16YF1412700)

摘　　要：We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.

关 键 词：above-threshold harmonics excited state mid-infrared femtosecond laser 

分 类 号：O562[理学—原子与分子物理] TN24[理学—物理]