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

BAI Yu1,2,YANG Jian-feng1,MA Xiao-long1,RUAN Ping1,TIAN Hai-xia3(1 Laboratory of Space Optics,Xi′an Institute of Optics and Precision Mechanics,Chinese Academy of Science,Xi′an 710119,China)(2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China)(3 China Airborne Missile Academy,Luoyang,Henan 471009,China)  
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.
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