红外3.7～4.8μm波段折射/衍射光学系统的消热差设计  

An Athermal Design of Infrared Hybrid Diffractive/Refractive Optical System in 3.7～4.8 μm

作　　者：白瑜[1,2] 杨建峰[1] 马小龙[1] 阮萍[1] 田海霞[3] 

机构地区：[1]中国科学院西安光学精密机械研究所空间光学研究室,西安710119 [2]中国科学院研究生院,北京100049 [3]中国空空导弹研究院,河南洛阳471009

出　　处：《光子学报》2009年第9期2261-2264,共4页Acta Photonica Sinica

基　　金：国家自然基金(40301031)资助

摘　　要：研究了衍射光学元件在红外折射/衍射混合光学系统中的消热差特性并给出了具体设计实例,该系统工作波段为3.7～4.8μm,全视场角为7.12°,满足100%冷光阑效率.系统仅采用硅和锗两种材料,设计结果表明,该系统在-50～100℃温度范围内不仅成像质量接近衍射极限,而且结构简单、体积小、质量轻,适用于像元尺寸为30μm、像元数320×240的凝视焦平面阵列探测器.The athermalism of diffractive optical element in infrared hybrid diffractive/ refractive optical system is analyzed. An athermal infrared optical system with 3.7-4.8 μm spectral region,6.44 degrees of field of view is presented,, and the infrared system satisfies 100% cold shield efficiency. Germanium and silicon are used in the system. The image quality of the system approaches the diffraction limit in the working temperature range -50℃-100 ℃. The optical system has simple structure, small volume and light weight. It is compatible with staring focal plane array which has a format of 320 × 240 and the pixel pitch of 30 μm.

关 键 词：衍射光学 消热差 光学设计 红外光学系统 

分 类 号：TH74[机械工程—光学工程]