设计一种高分辨率中波红外成像制导光学系统。采用折射一次成像的结构形式，初始结构为远摄型物镜组。所设计的系统共用3个光学元件，通过引入非球面和二元光学衍射元件，增加光学设计的自由度，全视场达到10°，系统总长为49 mm，焦距为70 mm。并且系统在-40℃~60℃温度范围内具有良好的消热差作用，成像质量接近衍射极限，最大弥散斑直径小于15 μm。适用于像元数为640×512，像元尺寸为15 μm，F数为2的红外焦平面探测器。系统具有成像分辨率高、视场大且体积小等优点，可用于小型红外导引头中。

A mid-wave infrared imaging guiding system with high resolution is designed. First imaging refractive system and telephoto lens groupe are used for the initialized structure. The system with three optical elements, the all field of view of 10°, a focal length of 70mm, and the total length of 49mm is designed. Within -40℃~60℃, the system possesses better athermal performance. The image quality of the system almost approaches the diffraction limit. The biggest defocused spot's diameter is less than 15μm. It is applicable to the infrared focal plane arrays（IR FPA）detector with the format of 640×512, the pixel size of 15μm and the Fnumber of 2. This system can suffice the requirements design of infrared seeker, which has the advantages of high resolution, wide field and small volume.