基于神光Ⅲ原型装置的成像型任意反射面速度干涉仪

Imaging velocity interferometer system for any reflector based on SG-Ⅲ prototype laser facility

介绍了基于神光Ⅲ原型装置的成像型任意反射面速度干涉仪(VISAR)的系统结构和实验结果,详细阐述了为解决VISAR系统的光路对接调试、干涉仪零程差状态保持、探针激光方式、条纹相机触发时间等问题而采取的特殊手段。对系统性能进行了测试,结果表明:时间分辨力优于30 ps,空间分辨力优于10μm,测速范围为10～50 km.s-1。通过神光Ⅲ原型装置进行打靶实验,结果表明:该系统能获得透明材料中冲击波作用形成的清晰干涉条纹,能依据条纹分布情况来判断冲击波在空间不同位置的作用情况。对双灵敏度结构获得的两幅条纹图像进行处理,计算得到了冲击波在透明材料中的传播速度为36.5 km.s-1。

Imaging velocity interferometer system for any reflector（VISAR） is an important diagnostic facility for the measurement of the shock wave velocity in the transparent material.An imaging VISAR has been installed and used in the SG-Ⅲ prototype laser facility.The key points and special techniques in designing an imaging VISAR are described in detail.Analyzing and testing the capability of the imaging VISAR indicates that the temporal resolution of the system is 30 ps,and the spatial resolution is better than 10 μm.Experiments are carried out on the SG-Ⅲ prototype laser facility and high quality interference images are obtained.