针对目前检验方法制约大口径、大相对孔径凹非球面反射镜的应用,提出一种基于贴合双透镜的大口径、大相对孔径凹非球面检验方法。与Offner检验方法不同,检验光路中的透镜在反射前后的光路中分别作为校正透镜和自准镜。根据三级像差理论推导初始结构,给出利用单透镜和贴合双透镜检验凹抛物面的残余像差曲线图,并对其进行分析。实验结果表明,自准校正透镜位于共轭后点前的检验方法可以用于大口径、大相对孔径凹非球面反射镜的检验。所提方法从加工、装配和使用等方面考虑更简单方便,为凹非球面检验提供新的思路,并且为利用三透镜检验更大口径和相对孔径的凹非球面打下基础。

Because of the current testing methods restricting the application of large-aperture, large-relative aperture concave aspheric mirrors, a large-aperture, large-relative aperture concave aspheric surface testing method based on near-double-lens is proposed. Different from the Offner testing method, the lens in the testing optical path is used as a correcting lens and a self-collimating-lens in the optical path before and after reflection. The initial structure is derived according to the third-order aberration theory. The testing results of using a single lens and a near-double-lens as correcting lens are shown in diagrams respectively and analyzed. The experimental results show that the testing method in which the self-collimating lens is located in front of the conjugate back point can be used for the testing of large-aperture, large-relative-aperture concave aspheric mirrors. The proposed method is simpler and more convenient in terms of processing, assembly and use, and provides a new idea for the testing of concave aspheric surfaces, and lays a foundation for the use of three lenses to test concave aspheric surfaces with larger apertures and relative apertures.