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当前对空间望远镜光学系统的要求是:在宽光谱范围内,系统具有分辨率高、质量轻等特点,衍射望远镜可以满足上述要求。利用Schupmann提出的消色差理论可实现系统宽光谱覆盖,采用平面衍射透镜做物镜可使系统轻量化,降低了成本。设计了一个物镜口径为1000mm,f/#=100,用离轴三反射镜做目镜的衍射望远镜。设计结果表明:系统在0.65～0.75μm波段,0.02°×0.035°视场范围内,得到了消色差,接近衍射极限的成像质量。
At present, the requirements of the optical system of the space telescope are that the system has the characteristics of high resolution and light weight in a wide spectral range, and the diffraction telescope can meet the above requirements. The achromatic theory proposed by Schupmann can achieve wide spectral coverage of the system. The use of a plane diffraction lens as the objective lens can reduce the system weight and reduce the cost. Design a lens diameter of 1000mm, f / # = 100, the use of off-axis three mirror eyepiece telescope. The design results show that the system achieves the achromatic and nearly diffraction-limited image quality in the field of 0.65 ~ 0.75μm and 0.02 ° × 0.035 °.