大口径空间相机反射镜高反膜研究进展

Research progress of high-reflection coatings on mirrors of large-aperture space cameras

大口径反射镜高反膜是大口径空间相机光学系统中的重要光学元件。为了观测到更多的目标、获取更多的地球以及空间观测信息,对大口径空间相机的反向射膜提出了更高要求,即要求有更宽的工作谱段和更高的反射率,还要提升基底光学性能,降低空间环境对高反膜性能的影响以及降低薄膜应力等等。对近年国内外天基大口径空间相机反射镜高反膜研究进行了综述,概述了针对以上要求所取得的成果。尽管高反膜的设计制造仍面临许多困难,但随着研究的深入与新方法的提出,这几方面难点已基本找到解决的途径。

The high reflection film of large aperture mirror is an important optical element in the optical system of large aperture space camera.In order to observe more targets and obtain more earth and space observation information,higher requirements were put forward for the retro reflective film of large aperture space camera.It was necessary to have a wider working spectrum and higher reflectivity toimprove the optical performance of the substrate and to reduce the influence of space environment on the performance of the high reflection film and the stress of the film.In this paper,the achievements in the research of high reflective film for large aperture space camera mirrors at home and abroad in recent years were reviewed.The review shows that,although there are still many difficulties in the design and manufacture of high reflection film,with the deepening of research and the proposal of new methods,the solutions to these difficulties have been basically found.