宽温度范围双层衍射元件优化设计及应用  

Optimal Design and Application of Double-Layer Diffractive Optical Element over Wide Temperature Range

作　　者：毛珊 赖涛 聂怀乐 唐玉凤 宋逸辰 赵建林[1,2] Mao Shan;Lai Tao;Nie Huaile;Tang Yufeng;Song Yichen;Zhao Jianlin(Key Laboratory of Light-Field Manipulation and Information Acquisition,Ministry of Industry and Information Technology,School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710129,Shaanxi,China;Shaanxi Key Laboratory of Optical Information Technology,School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710129,Shaanxi,China)

机构地区：[1]西北工业大学物理科学与技术学院光场调控与信息感知工业和信息化部重点实验室,陕西西安710129 [2]西北工业大学物理科学与技术学院陕西省光信息技术重点实验室,陕西西安710129

出　　处：《光学学报》2023年第8期384-392,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61927810,61905195);中国科学院光谱成像技术重点实验室开放基金课题(LSIT202006W);西北工业大学中央高校基本科研业务(310202011QD001);西安市青年人才托举项目(095920201316)。

摘　　要：建立了环境温度对双层衍射元件衍射效率影响的数学模型,给出高衍射效率衍射元件的优化设计方法。通过选择宽温度范围内设计波长对,计算衍射元件微结构参数,确保双层衍射元件在基底材料确定的情况下仍具有高衍射效率,发现混合成像光学系统具有最佳像质。最后设计了一套含有此双层衍射元件的中波红外混合成像光学系统。结果表明,与传统设计相比,本文方法能够有效地改善混合成像光学系统的无热化设计像质,设计结果更好。Objective Infrared optical systems have unique advantages in infrared guidance,target identification and tracking,battlefield reconnaissance,anti-stealth,and other fields.However,the optical materials used in such systems are rare,which causes the disadvantages of complex systems,time-consuming calculations,and so on.Multi-layer diffractive optical elements(MLDOEs)can achieve high diffraction efficiency over a wide waveband.Hybrid imaging optical systems composed of diffractive optical elements(DOEs)with special imaging characteristics and refractive lenses can not only meet the requirements of high-quality imaging but also reduce the number of lenses,system weight,and system cost.Especially,the MLDOEs applied in infrared optical systems can correct both color and thermal aberrations,thereby effectively reducing the system's complexity and dependence on optical materials.However,the ambient temperature affects diffraction efficiency and further influences the modulation transfer function(MTF)of the hybrid imaging optical system.So,it is an important research topic in the field of infrared optics,and research should be conducted on investigating the effect of temperature change on a hybrid imaging optical system,proposing a suitable athermalization design,reducing the effect of temperature on imaging quality,and enhancing the temperature adaptability of the hybrid infrared optical system.Methods This paper selects the commonly used separated double-layer DOE as an example to illustrate the microstructure changes caused by the changes in the ambient temperature(Fig.1).A concept and a model of temperaturebandwidth integral average diffraction efficiency(TBIADE)are proposed to represent the comprehensive diffraction characteristics of a DOE in a certain temperature range and working waveband,and the optimal design of a double-layer DOE is achieved by selecting the design wavelength pair.Then,a cooled hybrid imaging optical system in the mid-infrared waveband is optimally designed with ZnSe-Ge as the substrate materia

关 键 词：光学设计 衍射元件 折衍混合成像光学系统 无热化设计 

分 类 号：O436[机械工程—光学工程]