110GHz太赫兹波大气击穿阈值及最大传输能量密度  

Air breakdown threshold and maximum transmitted energy density of 110 GHz terahertz waves

作　　者：朱连燕[1] 廖成[1] 杨丹[1] 赵朋程[1] 

机构地区：[1]西南交通大学电磁场与微波技术研究所,成都610031

出　　处：《强激光与粒子束》2013年第6期1435-1439,共5页High Power Laser and Particle Beams

基　　金：中央高校基本科研业务费专项资金项目(SWJTU12CX082);认知无线电与信息处理教育部重点实验室开放基金项目(2011KF05)

摘　　要：随着110GHz高功率太赫兹波功率容量的提升,其引起的大气击穿问题越来越受到重视。将若干等效电离参数表达式引入到电子雪崩密度方程中,计算了不同压强下的大气击穿阈值。结果表明,由Ali等效电离参数得到的110GHz击穿阈值与实验数据符合得很好。在此基础上,利用Ali等效电离参数对逃逸传输能量密度与太赫兹波振幅的关系进行了分析。结果表明,当太赫兹波振幅小于击穿阈值时,逃逸传输能量密度随功率密度的增加线性增加;当太赫兹波振幅大于击穿阈值时,逃逸传输能量密度随功率密度先减小后增大。With the development of the power capacity of 110 GHz high-power terahertz waves, the air breakdown by 110 GHz high-power terahertz waves has drawn more and more attention. Several approximations of effective ionization parameters are introduced into the equation of the electron avalanche density, and the breakdown thresholds are calculated at different pressures. The results show that the breakdown thresholds from Ali effective ionization parameters agree very well with the experimental result. The dependence of transmitted energy density on the electric amplitude is also investigated using Ali effective ionization parameters. The results show that, the transmitted energy density increases with the power density linearly when the amplitude is lower than the breakdown threshold; but the transmitted energy density first increases with the amplitude and then decreases when the amplitude is larger than the breakdown threshold.

关 键 词：太赫兹波 击穿阈值 逃逸时间 功率密度 等效电场 压强 

分 类 号：TN011.2[电子电信—物理电子学]