Plasma channel formed by ultraviolet laser pulses at 193 nm in air  

作　　者：马媛媛 鲁欣 奚婷婷 龚旗煌 张杰 

机构地区：[1]State Key Laboratory for Mesoscopic Physics,Department of Physics,Peking University [2]Laboratory of Optical Physics,Institute of Physics,Chinese Academy of Sciences [3]Department of Physics,Graduate University of Chinese Academy of Sciences [4]Department of Physics,Shanghai Jiao Tong University

出　　处：《Chinese Optics Letters》2009年第9期865-868,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.60621063,10634020,10734130,and 10521002);the National "973" Program of China(Nos.2007CB815101 and 2006CB806007).

摘　　要：The propagation of picosecond deep ultraviolet laser pulse at wavelength of 193 nm in air is numerically investigated. Long plasma channel can be formed due to the competition between Kerr self-focusing and ionization induced defocusing. The plasma channel with electron density of above 10^13/cm^3 can be formed over 70 m by 50-ps, 20-mJ laser pulses. The fluctuation of laser intensity and electron density inside ultraviolet （UV） plasma channel is significantly lower UV laser by air is considered in the simulation and it the limit of the length of plasma channel. than that of infrared pulse. The linear absorption of is shown that the linear absorption is important for the limit of the length of plasma channel.The propagation of picosecond deep ultraviolet laser pulse at wavelength of 193 nm in air is numerically investigated. Long plasma channel can be formed due to the competition between Kerr self-focusing and ionization induced defocusing. The plasma channel with electron density of above 10^13/cm^3 can be formed over 70 m by 50-ps, 20-mJ laser pulses. The fluctuation of laser intensity and electron density inside ultraviolet （UV） plasma channel is significantly lower UV laser by air is considered in the simulation and it the limit of the length of plasma channel. than that of infrared pulse. The linear absorption of is shown that the linear absorption is important for the limit of the length of plasma channel.

关 键 词：Absorption Carrier concentration Electron density measurement ELECTRONS Laser pulses LASERS PLASMAS 

分 类 号：TN241[电子电信—物理电子学]