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分析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，指出衍射光学元件本身对热差的贡献是微小的，但它的特殊色散特性却在红外折射－衍射混合光学系统设计中间接地起到了消热差的作用。设计了适用于３～５μｍ波段的红外折射－衍射混合光学系统并进行了分析。
The characteristic of extinction difference of diffractive optical element in infrared refraction - diffraction hybrid optical system is analyzed. It is pointed out that the contribution of diffractive optical element to thermal difference is tiny, but its special dispersion characteristic is in the design of infrared refraction - diffraction hybrid optical system Indirectly played the role of negative heat difference. An infrared refraction - diffraction hybrid optical system suitable for 3 ~ 5μm band was designed and analyzed.