Characteristics of Laser Produced Plasmas Obtained by Fast ICCD Photography, Schlieren Photography and Optical Emission Spectroscopy

作     者：WEI Wenfu WU Jian LI Xingwen JIA Shenli QIU Aici 

作者机构：State Key Laboratory of Electrical Insulation and Power Equipment Xi' an Jiaotong University Xi'an 710049 China 

出 版 物：《高电压技术》 (High Voltage Engineering)

年 卷 期：2013年第39卷第9期

页      面：2173-2179页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 0803[工学-光学工程] 

基　　金：Project supported by National Natural Science Foundation of China(51237006) 

主　　题：等离子体密度 发射光谱仪 纹影摄影 激光产生 ICCD 生产 特性 等离子体参数 

摘      要：Pulsed laser produced plasmas(LPP)are important for industrial applications and fundamental researches,and their complex,multi-physical and cross-chemical processes need to be investigated more *** this work,images of the luminous plasma,the spatial density distribution,and the plasma parameters are experimentally investigated by using fast ICCD photography,schlieren photography,and optical emission *** are produced by a 1 064 nm,15 ns Nd:YAG *** expanding and splitting phenomena are observed in vacuum(at the pressure of about 1×10 3Pa)and air(at the pressure of 20 Pa)using fast photography,***,shock waves formed in the atmospheric laser produced plasma are visualized by schlieren *** formation of shock waves is interpreted with the Sedov-Taylor theory,and an averaged expansion velocity about 375 m/s of the shock waves is estimated during 200～1 000 *** air is found to have significant confinement effects on the plasma expansions compared to that in vacuum or low pressure *** on the optical emission spectroscopy,after 1 000 ns,at 0.6 mm above the target,the plasma temperature is about 7 800 K and the electron number density is approximately 0.64×1016cm-3.