广角任意反射面速度干涉仪的光学性质研究

Optical properties of wide-angle velocity interferometer system for any reflector

研究了广角任意反射面速度干涉仪(VISAR)的光学性质。阐述了广角VISAR的原理,指出广角诊断靶中椭球镜的作用是将靶丸内表面成虚像在靶丸中心附近。使用Zemax模拟了成像弯曲对动态干涉条纹形成的影响,提出使用异形光纤面板进行像面矫正。研究了工程误差对干涉仪成像的影响,若要取得良好的成像效果,椭球镜的位置偏差不得多于30μm,倾角不得超过4°,长轴方向加工误差需小于0.1μm,短轴方向误差需小于4μm,镜面反射率应高于70%。讨论了广角VISAR光学研究的进一步发展方向如影响动态条纹的更多可能因素、像面矫正的其他方法、物与像面的光学对应等。

Optical properties of wide-angle velocity interferometer system for any reflector(VISAR) are studied in this paper.The principle of wide-angle VISAR is expounded.It reveals that the role of the ellipsoid in wide-angle VISAR is to make the inner surface of capsule into a curved virtual image at the center of target.The effect of imaging bending on the formation of dynamic interference fringes is simulated by Zemax and a shaped optical fiber plate is proposed for image correction.The influence of assembly error is also studied.To obtain a good imaging result,the positional deviation of the ellipsoidal mirror should not exceed 30 μm,the inclination should not exceed 4°,the manufacturing error requires less than 0.1 μm in long axis direction and 4 μm in short axis direction,and reflectance needs to be higher than 70%.More possible factors of affecting dynamic fringes,other methods of imaging correction,correspondence between object and image are discussed, along with the potential development of wide-angle VISAR.The optical properties of wide-angle VISAR is a basis for improving the wide- angle diagnostic capability,and is of great significance for the quantitative observation for driving symmetry of capsule in inertial confinement fusion.