Shock dynamics and shock collision in foam layered targets

来源 :HighPowerLaserScienceandEngineering | 被引量 : 0次 | 上传用户:chenpeng12333
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
We present an experimental study of the dynamics of shocks generated by the interaction of a double-spot laser in different kinds of targets: simple aluminum foils and foam–aluminum layered targets. The experiment was performed using the Prague PALS iodine laser working at 0.44 μm wavelength and irradiance of a few 1015 W/cm2. Shock breakouts for pure Al and for foam-Al targets have been recorded using time-resolved self-emission diagnostics. Experimental results have been compared with numerical simulations. The shocks originating from two spots move forward and expand radially in the targets, finally colliding in the intermediate region and producing a very strong increase in pressure. This is particularly clear for the case of foam layered targets, where we also observed a delay of shock breakout and a spatial redistribution of the pressure. The influence of the foam layer doped with high-Z (Au) nanoparticles on the shock dynamics was also studied.
其他文献
期刊
提出一种利用光学波分复用器实现实时高效联合变换相关的方案。通过计算机控制把输入面分为多个大小相等的窗口,分别写入参考与目标图像,利用光学波分复用器于相关系统中,使对应不同窗口的读出光学信息在第一个焦面上形成联合功率谱阵列,在输出面上可以实时地获得增强了的相关信号。实时高效联合变换相关系统既充分利用了读出光能又充分利用了光问的有效面积。文中分析了系统原理,给出了光学波分复用器的设计方案及实验结果。
We demonstrate that the methodology of frequency-resolved optical gating (FROG) is applicable to time-resolved reflection spectroscopy of a plasma mirror in the vacuum-ultraviolet (VUV) region. Our recent study [R. Itakura et al. Opt. Express 23, 10914 (2
期刊
A 473-nm-laser-tuned whispering gallery mode (WGM) silica microbubble resonator integrated with iron oxide particles is demonstrated in this paper. Owing to the photo-induced thermal effect, the WGM resonance wavelength could be tuned by adjusting laser p
期刊
因散射体运动而随时间变化的散斑现象称为动态散斑。研究了激光入射光束与圆锥体旋转中心线垂直情况下的动态散斑空间时间相关函数,并简化出归一化时间相关函数,表明动态散斑的统计特性与旋转速度、曲率半径、表面微观结构和光学几何结构有关。测量了圆锥体在不同旋转速度下的动态散斑统计特性图像。数值计算聚四氟乙烯和硬铝两种材料的圆锥体在不同速度下的归一化时间相关函数,表明速度越快,其归一化时间相关函数下降得越快,在相同速度下硬铝材料的归一化时间相关函数比聚四氟乙烯材料下降得要快。实验结果与理论推导比较相符。
期刊
As a new-generation light source, free-electron lasers (FELs) provide high-brightness x-ray pulses at the angstrom-femtosecond space and time scales. The fundamental physics behind the FEL is the interaction between an electromagnetic wave and a relativis
多光子过程的研究在开始影响着人们对光的产生和吸收过程的理解。在讨论多光子过程的欧洲物理研究会上,有一篇论文报道了双光子过程所引起的碰撞能量转移在60毫微米附近所产生的强真空紫外输出。不过,在会议上最突出的还是关于吸收过程的研究,特别是有关原子的多光子电离和分子的红外多光子激励和解离的研究。
期刊
期刊