Design of Cooled Refractive-Diffractive Hybrid Dual-Band Infrared Optical System
The dual-band infrared optical system,which can work in both medium wave and long wave infrared bands,can effectively utilize the information of these two bands and realize complementary advantages. Therefore,its detection perfor-mance can be significantly improved and the application prospect is broad. Double-layer harmonic diffractive optical element not only has the dispersion characteristics opposite to the traditional infrared lens,but also can obtain high diffraction efficiency at multiple design wavelengths,which provides a new idea for the design of dual-band infrared optical system. In this paper,the theory of double-layer harmonic diffractive optical element is studied,and based on the double-layer harmonic diffractive optical element,the design of a cooled refractive-diffractive hybrid dual-band infrared optical system with a focal length of 200 mm and F 2 is completed. The results of imaging quality analysis and Narcissus analysis show that various aberrations of the designed optical system have been effectively corrected,and the imaging quality is excellent.
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