光子学报, 2009, 38 (9): 2261, 网络出版: 2010-05-10
红外3.7～4.8 μm波段折射/衍射光学系统的消热差设计*
An Athermal Design of Infrared Hybrid Diffractive/Refractive Optical System in 3.7～4.8 μm
摘要
研究了衍射光学元件在红外折射/衍射混合光学系统中的消热差特性并给出了具体设计实例, 该系统工作波段为3.7～4.8 μm, 全视场角为7.12°, 满足100％冷光阑效率.系统仅采用硅和锗两种材料, 设计结果表明, 该系统在－50～100℃温度范围内不仅成像质量接近衍射极限, 而且结构简单、体积小、质量轻, 适用于像元尺寸为30 μm、像元数320×240的凝视焦平面阵列探测器.
Abstract
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.
白瑜, 杨建峰, 马小龙, 阮萍, 田海霞. 红外3.7～4.8 μm波段折射/衍射光学系统的消热差设计*[J]. 光子学报, 2009, 38(9): 2261. BAI Yu, YANG Jian-feng, MA Xiao-long, RUAN Ping, TIAN Hai-xia. An Athermal Design of Infrared Hybrid Diffractive/Refractive Optical System in 3.7～4.8 μm[J]. ACTA PHOTONICA SINICA, 2009, 38(9): 2261.
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