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Athermal Design for MW Infrared Dual Field-of-View Optical System

CHEN Lv-ji,LI Ping,FENG Sheng-rong,HU Hai-Shuang(Kunming Institute of Physics,Kunming 650223,China)  
A rotate-zoom optical system for medium wave 320×240 element IR FPA(Focal Plane Arrays) detector is designed in this paper.The operating waveband of the system is 3.7~4.8 ?m,and zoom ratio is 3×.The optical passive athermalization method is introduced to realize a high image quality in a wide temperature range of-40℃~60℃.Design result showed the rotate-zoom system has simple mechanism,compact structure,light weight,excellent image quality,and reliable performance within required temperature range.The optical system image quality is evaluated with the ZEMAX optical design software.
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