为减小大口径光学窗口对系统入射光线的影响, 提高光学窗口性能及光学系统成像质量, 提出了基于普通环带支撑的中间环带辅助支撑形式, 并在不同口径、径厚比及遮拦比状态下比较两种支撑方式对光学系统波前误差的影响。与普通环带支撑方式相比, 采用中间环带辅助支撑形式可以降低90%的由窗口引入的波前误差, 该方式对径厚比为100/1的窗口的支撑效果可以达到普通支撑方式下径厚比为100/3的窗口类似的支撑效果。因此, 中间环带辅助支撑形式可以有效提高窗口支撑效率、减小窗口厚度及质量、降低窗口对入射光线的体吸收率。

In order to reduce the influence of large aperture optical window on the system’s incident light and strengthen the performance of optical window and the imaging quality of the optical system, an intermediate zonal auxiliary supporting form (IZASF) based on the ordinary zonal supporting form (OZSF) is proposed in this paper. The influence of these two supporting forms on the wavefront error of optical system was compared under different caliber, thickness ratio and obscuration ratio. Compared with the ordinary zonal supporting form, the intermediate zonal auxiliary supporting form can reduce the wavefront error of the window by 90%. The wavefront error of this window with diameter-thickness ratio 100∶1 and the supporting form IZASF is similar to that of the window with diameter-thickness ratio 100∶3 and the supporting form OZSF. Therefore, the IZASF can effectively improve the supporting efficiency of window and reduce the window thickness and quality. It can also reduce absorbance of the incident light, thus it has great significance to improve the performance and expand the application environment of optical telescopes further.