大口径批量化离轴非球面镜的检测光路设计

为了检测极大口径望远镜非球面离轴子镜的面形精度，设计一种通用的干涉检测光路。综合利用透射式和衍射式补偿器的优点，设计消球差单透镜和计算全息片共同对非球面度进行补偿。对于大口径、批量化的离轴非球面镜，搭建一个检验光路，检测不同离轴量的子镜时只需更换计算全息片，最大程度上节约成本。设计结果表明对于顶点曲率半径60 m、二次常数K=-1.000954、母镜口径Φ30 m、子镜口径Φ1.5 m、离轴量分别为2.5、8、14.5 m 的子镜，均可以在一种光路结构中实现高精度零位检测。

Abstract

In order to test optical figure of aspheric off-axis segments of extremely large telescope, we present a new optical testing method. Take advantages of transmission and diffraction nulls, the aspheric departure is accommodated by both aplanatic lens and computer generated holograms. For plenty of large off-axis aspherical mirrors, only one optical path needs to be built. Different segments will be measured by replacing computer generated hologram (CGH). Design results show that, for different off-axis magnitudes as 2.5 m, 8 m and 14.5 m of a primary mirror with 60 m vertex curvature radius, conic constant K=-1.000954, parent mirror diameter Φ30 m, segment diameter Φ1.5 m, all can achieve self-collimation null tests in one light path structure.

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徐秋云, 徐晨, 李博, 李新南. 大口径批量化离轴非球面镜的检测光路设计[J]. 光学学报, 2015, 35(10): 1012005. Xu Qiuyun, Xu Chen, Li Bo, Li Xinnan. Optical Testing Design for Plenty of Large Off-Axis Aspherical Mirrors[J]. Acta Optica Sinica, 2015, 35(10): 1012005.

大口径批量化离轴非球面镜的检测光路设计

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