Nonstationary laser-supported ionization wave in layer of porous substance with subcritical density  

作　　者：S.Yu Gus’kov R.A.Yakhin 

机构地区：[1]P.N.Lebedev Physical Institute of Russian Academy of Sciences,Leninskii Prospect 53,Moscow 119991,Russia

出　　处：《Matter and Radiation at Extremes》2024年第1期58-70,共13页极端条件下的物质与辐射（英文）

摘　　要：A time-dependent analytical solution is found for the velocity of a plane ionization wave generated under nanosecond laser pulse action on the surface of a flat layer of low-Z porous substance with density less than the critical density of the produced plasma.With corrections for the two-dimensional nature of the problem when a laser beam of finite radius interacts with a flat target,this solution is in quantitative agreement with measurements of ionization wave velocity in various experiments.The solution compared with experimental data covering wide ranges of performance conditions,namely,(3-8)×10^(14)W cm^(−2)for laser pulse intensity,0.3-3 ns for pulse duration,0.35-0.53μm for laser wavelength,100-1000μm for laser beam radius,380-950μm for layer thickness,4.5-12 mg cm^(−3)for average density of porous substance,and 1-25μm for average pore size.The parameters of the laser beam that ensure the generation of a plane ionization wave in a layer of subcritical porous matter are determined for the problem statements and are found to meet the requirements of practical applications.

关 键 词：LASER PULSE POROUS 

分 类 号：TN24[电子电信—物理电子学]