利用折射/谐衍射结构设计了超宽温范围内的被动式消热差红外物镜系统.该系统由三片镜子组成，使用锗和硒化锌两种材料，引入一个非球面和一个谐衍射面,实现了消热差、消色差和结构简单轻量化.实验结果表明: 在焦距为54.68 mm，-120～100 ℃温度范围内,系统可以在3.8～4.2 μm和8.8～11.2 μm光谱范围同时工作，且光谱范围的调制传递函数分别优于0.42和0.35，成像质量良好，适用于像元尺寸为30 μm、像元数320×240的红外双色探测器.

A hybrid refractive/harmonic diffractive infrared lens beyond normal temperature was designed. The infrared lens was consisted of three lenses, including one aspheric surfaces and a harmonic diffraction surface which made the lens have compact structure and light weight. The experimental results show that the modulation transfer function is above 0.42 and 0.35 in the temperature range of -120～100 ℃ when the working wavelength in 3.8～4.2 μm and 8.8～11.2 μm, and the efficient focal length is 54.68 mm. It is compatible with infrared dual-color detector which had a format of 320×240 and the pixel pitch of 30 μm.