Theoretical analysis and numerical simulation of the impulse delivering from laser-produced plasma to solid target  

作　　者：杨雁南 杨波 朱金荣 沈中华 陆建 倪晓武 

机构地区：[1]Department of Applied Physics,Nanjing University of Aeronautics and Astronautics [2]Department of Applied Physics,Nanjing University of Science and Technology [3]College of Physics Science and Technology,Yangzhou University

出　　处：《Chinese Physics B》2008年第4期1318-1325,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 60578015);the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20050288025);the Foundation of the Ministry of Education of China for Outstanding Young Teachers in University (2003-2008)

摘　　要：A plasma is produced in air by using a high-intensity Q-switch Nd：YAG pulsed laser to irradiate a solid target, and the impulses delivering from the plasma to the target are measured at different laser power densities. Analysing the formation process of laser plasma and the laser supported detonation wave （LSDW） and using fluid mechanics theory and Pirri＇s methods, an approximately theoretical solution of the impulse delivering from the plasma to the target under our experimental condition is found. Furthermore, according to the formation time of plasma and the variation of pressure in plasma in a non-equilibrium state, a physical model of the interaction between the pulse laser and the solid target is developed. The plasma evolutions with time during and after the laser pulse irradiating the target are simulated numerically by using a three-dimensional difference scheme. And the numerical solutions of the impulse delivering from the plasma to the target are obtained. A comparison among the theoretical, numerical and experimental results and their analyses are performed. The experimental results are explained reasonably. The consistency between numerical results and experimental results implies that the numerical calculation model used in this paper can well describe the mechanical action of the laser on the target.A plasma is produced in air by using a high-intensity Q-switch Nd：YAG pulsed laser to irradiate a solid target, and the impulses delivering from the plasma to the target are measured at different laser power densities. Analysing the formation process of laser plasma and the laser supported detonation wave （LSDW） and using fluid mechanics theory and Pirri＇s methods, an approximately theoretical solution of the impulse delivering from the plasma to the target under our experimental condition is found. Furthermore, according to the formation time of plasma and the variation of pressure in plasma in a non-equilibrium state, a physical model of the interaction between the pulse laser and the solid target is developed. The plasma evolutions with time during and after the laser pulse irradiating the target are simulated numerically by using a three-dimensional difference scheme. And the numerical solutions of the impulse delivering from the plasma to the target are obtained. A comparison among the theoretical, numerical and experimental results and their analyses are performed. The experimental results are explained reasonably. The consistency between numerical results and experimental results implies that the numerical calculation model used in this paper can well describe the mechanical action of the laser on the target.

关 键 词：plasma production and heating by laser beams solid-plasma interactions IMPULSE fluiddynamics simulation 

分 类 号：O53[理学—等离子体物理]