Terahertz emission by balanced nonlinear ef fects in air plasma  

作　　者：许荣杰 白亚 宋立伟 李娜 彭鹏 刘鹏 

机构地区：[1]MOE Key Laboratory of Advanced Micro-structured Materials,Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University [2]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences

出　　处：《Chinese Optics Letters》2013年第12期83-86,共4页中国光学快报（英文版）

基　　金：supported by the Chinese Academy of Sciences,the Chinese Ministry of Science and Technology;the National Natural Science Foundation of China(Nos.60978012,11274326,11134010,and 11127901);the National "973" Program of China(No.2011CB808103)

摘　　要：The evolution of terahertz （THz） waveform in air plasma driven by low-energy few-cycle laser pulses is investigated to improve the accuracy of the carrier envelope phase （CEP） determination. Based on the transient photocurrent model, a balanced spatial distribution of the Kerr and free-electron effects in the plasma is found at 109 μJ input energy. THz inversion occurs only once at the initial CEP of 0.5π, in which high-precision measurement of the CEP of few-cycle laser pulses is achieved.The evolution of terahertz （THz） waveform in air plasma driven by low-energy few-cycle laser pulses is investigated to improve the accuracy of the carrier envelope phase （CEP） determination. Based on the transient photocurrent model, a balanced spatial distribution of the Kerr and free-electron effects in the plasma is found at 109 μJ input energy. THz inversion occurs only once at the initial CEP of 0.5π, in which high-precision measurement of the CEP of few-cycle laser pulses is achieved.

关 键 词：Laser pulses Semiconducting gallium arsenide 

分 类 号：O53[理学—等离子体物理]