红外与毫米波学报2023，Vol.42Issue(6)：780-788,9.DOI:10.11972/j.issn.1001-9014.2023.06.011
飞秒三色谐波脉冲增强空气等离子体中太赫兹波的产生
Enhanced terahertz wave generation in air-plasma induced by femtosecond three-color harmonic pulses
摘要
Abstract
The generation of terahertz waves from air-plasma induced by femtosecond three-color harmonic pulses with a frequency ratio of 1:2:m(m is a positive integer),based on the transient photocurrent model and the saw-tooth-like electric field formed via multi-color harmonic pulses superposition,has been theoretically investigated.It can be seen that when the air is saturated ionized and the electron density reaches the same maximum,for the same number of harmonic pulses,terahertz conversion efficiency is not always higher when the electric field shape in the composed pulse envelope is closer to a sawtooth waveform and more asymmetric.Besides,the spe-cific wavelength combination schemes of femtosecond three-color harmonic pulses with the frequency ratios of 1:2:3 and 1:2:4 have also been simulated,which can significantly enhance the generation of terahertz waves,and are realized by adding only a set of optical parametric amplifiers on the basis of the conventional two-color laser pulse case at the frequency ratio of 1:2.Our study will be helpful to obtain intense terahertz sources and provide guidance for experimental operations.关键词
三色谐波脉冲/空气等离子体/波长组合方案/增强太赫兹波产生Key words
three-color harmonic pulses/air-plasma/wavelength combination scheme/enhanced terahertz wave generation分类
数理科学引用本文复制引用
王汉奇,范文慧,陈徐,闫慧..飞秒三色谐波脉冲增强空气等离子体中太赫兹波的产生[J].红外与毫米波学报,2023,42(6):780-788,9.基金项目
Supported by the National Natural Science Foundation of China(61675230,61905276) （61675230,61905276）
the Natural Science Foundation of Shaanxi Province(2020JQ-437) （2020JQ-437）
and the Open Research Fund of Key Laboratory of Spectral Imaging Technology,Chinese Academy of Sciences(LSIT201913N) （LSIT201913N）
