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Athermal Design for Infrared Hybrid Refractive/Diffractive Optical System

LI Sheng-hui YANG Chang-cheng ( Huazhong Institute of Electro-Optics, Wuhan 430073, China )  
Thermal properties of diffractive optical element are studied. A method for design athermal hybrid infrared optical system is introduced A hybrid refractive-diffractive infrared optical system at 3. 7-4. 8μm with 100% cold shield efficiency, 4. 5 degrees of field of view is designed The image quality of the system approachs the diffraction limit in the working temperature range -30-70℃. This system is compatible with cooled staring array imager with the picture element size of 30μm.
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