一种反射／折射／谐衍射三波段混合成像系统设计

综合使用反射/折射/谐衍射光学元件构建混合光学系统,实现可见、中波红外与长波红外三个波段的融合成像。利用卡塞格林系统主镜作为三波段共同通光孔径,次镜实现可见与红外波段分离;采用谐衍射光学元件与舒普曼结构实现一种材料消除红外系统色差;通过二次成像实现红外波段100%冷光阑效率,简化结构,成像质量接近衍射极限。

Optical design of a triple-waveband hybrid system

A new optical design of triple-waveband hybrid imaging system over the visible,MWIR and LWIR wavebands by combining reflective,refractive and harmonic diffractive elements was presented in this paper.The primary mirror of Cassegrain configuration was used as optical aperture for non chromatic and light weight,and the second mirror separates the IR bands transmitted and the visible band reflected.Using harmonic DOE and Schupmann configuration,the chromatic aberration of both IR bands was corrected by single material-Germanium.With secondary imaging form,the cold stop efficiency of IR bands was 100%.The triple-waveband lens system is powerful in providing diffractive-limited performance on light and compact configuration.