Experimental Investigation of the Properties of an Acoustic Wave Induced by Laser Ablation of a Solid Target in Water-Confined Plasma Propulsion  

作　　者：郑志远 高华 高禄 邢杰 

机构地区：[1]School of Science,China University of Geosciences

出　　处：《Plasma Science and Technology》2014年第11期1032-1035,共4页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.10905049);Fundamental Research Funds for the Central Universities of China(Nos.2562011256,2562010050)

摘　　要：Acoustic waves generated in nanosecond pulsed-laser ablation of a solid target in both air and water-confined environments were measured experimentally. It was found that the amplitude of the acoustic wave tended to decrease with an increase in water thickness. The waves were analyzed by means of fast Fourier transform. It was shown that there are several frequency components in the acoustic waves with the dominant frequency shifting from high frequency to low frequency as the thickness of the water layer increases. Furthermore, strong acoustic pressure led to enhancement of the coupling of the laser energy to the target in laser plasma propulsion.Acoustic waves generated in nanosecond pulsed-laser ablation of a solid target in both air and water-confined environments were measured experimentally. It was found that the amplitude of the acoustic wave tended to decrease with an increase in water thickness. The waves were analyzed by means of fast Fourier transform. It was shown that there are several frequency components in the acoustic waves with the dominant frequency shifting from high frequency to low frequency as the thickness of the water layer increases. Furthermore, strong acoustic pressure led to enhancement of the coupling of the laser energy to the target in laser plasma propulsion.

关 键 词：laser ablation acoustic wave PROPULSION 

分 类 号：O53[理学—等离子体物理]