激光聚变冲击波速度测量光学系统设计

针对激光聚变冲击波速度测量的需求,设计了一种集被动式扫描高温计和主动式冲击波速度测量于一体的复合冲击波速度测量系统。通过采用多种耐辐射光学玻璃材料,实现了共用光路的400~700 nm耐辐射消色差设计;通过采用自动控制干涉仪简化了系统操作;主动测速系统通过切换不同焦距的中继成像镜头,实现了不同放大倍率的切换。系统的物方视场为φ2.0 mm,主动式测速系统的放大倍率为10×,20×,30×,静态实验干涉条纹平直,调制度达到0.69以上,物方分辨率达到4.72μm。该系统在激光聚变装置上能够实现冲击波速度的动态测量。

Design of optical system for laser fusion shock velocity measurement

To meet the demands of laser fusion shock velocity measurements,a composite system that integrates a passive scanning optical pyrometer with an active shock wave velocity interferometer was designed in this study.The common-path lens was achromatic and designed in the range of 400-700 nm by using several types of radiation resistance optical materials.The mirrors of a Mach-Zehnder interferometer were motorized and could be controlled remotely,thereby simplifying the operation of the system.In addition,the system magnification could be altered by using different focal lengths with a streak camera coupling lens.The field of view of the combined system is 2 mm,and the magnification settings for the active velocity measuring system are 10×,20×,and 30×.The static interference fringes are straight,and their contrast is greater than 0.69.The system has a 4.72 μm spatial resolution.The system can be applied to dynamic measurement of shock velocity in a laser fusion device.