文献类型：期刊文献

英文题名：Nonlinear THz radiation investigated by quantum simulations

作者：Liu, Jing-Xue[1,2];Xu, Yan[3];Jia, Guang-Rui[1];Jiao, Zhao-Yong[1];Bian, Xue-Bin[1,2]

第一作者：Liu, Jing-Xue

通讯作者：Jia, GR[1];Bian, XB[1];Bian, XB[2]

机构：[1]Henan Normal Univ, Sch Phys, Xinxiang 453007, Henan, Peoples R China;[2]Chinese Acad Sci, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Inst Phys & Math, Innovat Acad Precis Measurement Sci & Technol, Wuhan 430071, Peoples R China;[3]Xinxiang Univ, Coll Phys & Elect Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Henan Normal Univ, Sch Phys, Xinxiang 453007, Henan, Peoples R China

通讯机构：[1]corresponding author), Henan Normal Univ, Sch Phys, Xinxiang 453007, Henan, Peoples R China;[2]corresponding author), Chinese Acad Sci, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Inst Phys & Math, Innovat Acad Precis Measurement Sci & Technol, Wuhan 430071, Peoples R China.

年份：2020

卷号：28

期号：5

起止页码：7565-7575

外文期刊名：OPTICS EXPRESS

收录：;EI(收录号：20201008272290);Scopus(收录号：2-s2.0-85080949940);WOS:【SCI-EXPANDED(收录号:WOS:000518435600132)】；

基金：National Key Research and Development Program of China (2019YFA0307702); National Natural Science Foundation of China (11674363, 91850121); Cooperative Project of Henan Normal University with Fuhuide Trade Co., Ltd of Henan Province (XH2019005); Ninth Group of Key Disciplines in Henan Province (2018119); Education Department of Henan Province (2011C140001).

语种：英文

外文关键词：Electric fields - Quantum chemistry - Radiation effects - Ultrashort pulses - Wave functions

摘要：Terahertz (THz) waves can be generated by the nonlinear interaction between ultrashort laser pulses and air. The semiclassical photocurrent model is widely used. It is simple, but neglects the quantum effects. Some theoretical works are based on solving the time-dependent Schrodinger equation. However, it meets the difficulty of prohibitively large boxes in long-time evolution. Here we adopted the wave-function splitting algorithm to fully contain the information of photoelectrons. The contributions of the excited states and interference effects in electron wavepackets to THz radiation are studied numerically. We also theoretically investigated the THz generation from nitrogen molecules in a biased electric field. It is found that the THz yield enhancement as a function of the static field strength in experiments can be reproduced well by our method. In addition, the restriction of wavelength and phase difference in the two-color laser fields is less strict in the presence of the static field. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement