激光烧蚀平面碳靶的等离子体形态演化  

Outline evolution of plasma from planar carbon target ablated by laser

作　　者：张兴强[1] 马真艳 ZHANG Xing-qiang;MA Zhen-yan(School of Mathematics,Physics and Optoelectronic Engineering,Hubei University of Automotive Technology,Shiyan 442002,China)

机构地区：[1]湖北汽车工业学院数理与光电工程学院,湖北十堰442002

出　　处：《激光与红外》2022年第5期659-664,共6页Laser & Infrared

基　　金：湖北省教育厅科研重点项目基金项目(No.D20102002);湖北汽车工业学院博士科研启动基金项目(No.BK200919)资助。

摘　　要：激光等离子体推进是未来航空航天领域极具应用前景的前沿技术之一,而激光等离子体的形态演化成为激光等离子体冲击波推进的必要条件。本文基于激光等离子体形成的基本理论,模拟了激光碳等离子体的形态参数。之后利用波长为1.064μm、脉宽约10 ns的Nd∶YAG激光器等设备研究了不同激光功率密度下碳等离子体的形态参数,测量数据证实了理论结果。此外,由彩色数字摄像机拍摄的图像表明,当激光器的工作电压从700 V上升到1100 V时,观察到激光碳等离子体从发育不全到充分发育,再到发育过度的演化过程。因此,激光碳等离子体充分发育的条件是:激光器的工作电压调节到850 V,平均输出能量达157.1mJ,功率密度为4.45×10^(9) W/cm^(2)。因等离子体的发育程度关系到激光等离子体冲击波的传播及作用,其研究成为激光等离子体冲击波推进的重要环节。Laser plasma propulsion is a strategic commanding point in the field of aerospace in the future,while the outline evolution of laser plasma has become a necessary condition for laser plasma shock wave propulsion.In this paper,based on the basic theory of the formation of laser plasma,the outline parameters of laser carbon plasma is simulated,then measured under different laser power density by using a Nd∶YAG laser with wavelength of 1.064μm and pulse width of 10 ns and so on.The simulated result is proved by the measured data.In addition,the images taken by a color digital camera show that the evolution procedure of laser carbon plasma can be observed from underdeveloped to fully developed,and then to overdeveloped when the operating voltage of the laser rises from 700 V to 1100 V.Thus the condition for fully developed laser carbon plasma is adjusting the working voltage of laser to 850 V,the average output energy is 157.1 mJ and power density is 4.45×109 W/cm2.As the developed degree of plasma correlates to the propagation and action of laser plasma shock wave,its research becomes an important step to laser plasma shock wave propulsion.

关 键 词：激光等离子体推进 激光碳等离子体 等离子体发育 形态演化 

分 类 号：O539[理学—等离子体物理]