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Athermal design of refractive-diffractive hybrid infrared optical systems

LIANG Ling,ZHANG Liang,PAN Xiao-dong(Luoyang Institute of Electro-Optical Equipment,AVIC Ⅰ,Luoyang 471009,China)  
The principle and design method of employing diffractive optical element to athermalize and achromatize an infrared optical system are expounded.Based on the distinct characteristics of the refractive and diffractive optical elements,a passive thermal-stable hybrid system is designed.The system has following parameters:waveband range is 3~5 μm,F/#=2,field-of-view is 8°×6°,focal length is 70.3 mm,a staring high-sensitivity focal plane array infrared detector comprised of 320×256 elements is adopted,each element is 30 μm.In this system,two kinds of material of Silicon and Germanium are used.Athermalization and achromatization are realized for the infrared imaging system in temperature range-40~60℃.Design result showed that refractive-diffractive hybrid system has better image quality,compact structure,light weight and reliable performance within required temperature range.Therefore,refractive/diffractive optical elements can find wider application in airborne infrared imaging system.
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