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双层衍射元件加工误差对带宽积分平均衍射效率的影响

Effect on Polychromatic Integral Diffraction Efficiency for Two-Layer Diffractive Optics

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摘要

双层衍射光学元件可以在宽波段范围内获得高的衍射效率。加工误差会导致带宽积分平均衍射效率的下降,进而影响折衍射混合成像光学系统的传递函数。基于位相延迟和带宽积分平均衍射效率的表达式,建立了双层衍射光学元件加工误差与带宽积分平均衍射效率的数学关系。分析了应用于8~12 μm 长波红外光学系统中的两种加工误差对双层衍射光学元件衍射效率的影响。采用带宽积分平均衍射效率,可以直接评价宽波段光学系统的成像质量。通过带宽积分平均衍射效率和双层衍射光学元件加工误差的关系,可以分析含有双层衍射元件混合光学系统的调制传递函数。

Abstract

Two- layer diffractive optics can achieve high diffraction efficiency at broad wavelength band. Manufacturing errors can result in loss of diffraction efficiency and further, influence modulation transfer function (MTF) of refractive and diffractive hybrid imaging optical system. Based on the expression of phase delay and polychromatic integral diffraction efficiency (PIDE), mathematical analysis model of relationship between manufacturing errors and polychromatic integral diffraction efficiency is presented. Two kinds of manufacturing errors applied in 8~12 μm far infrared optical system which results in diffraction efficiency of two-layer diffractive optics are studied. Method of PIDE can evaluate image quality of optical system over broadband wavelength. According to the relationship between PIDE and manufacturing errors, MTF for hybrid optical system consisting of two-layer diffractive optics can be analyzed.

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中图分类号:O436

DOI:10.3788/aos201636.0105001

所属栏目:衍射与光栅

收稿日期:2015-07-07

修改稿日期:2015-08-25

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作者单位    点击查看

毛珊:长春理工大学光电工程学院, 吉林 长春 130022
崔庆丰:长春理工大学光电工程学院, 吉林 长春 130022

联系人作者:毛珊(maoshan8633@sina.com)

备注:毛珊(1990—),女,博士研究生,主要从事光学设计和衍射光学方面的研究。

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