基于矢量衍射的光学系统设计与偏振像差补偿
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关键词：长波红外;偏振像差；光学系统设计；矢量衍射;数字微镜阵列中图分类号：0434.3 文献标志码：A doi：10.37188/CO.2025-0006 CSTR：32171.14.CO.2025-0006
Abstract：Aiming at the problem that the diffraction phenomenon generated in the long-wave infrared （LWIR） polarized optics system containing digital micro-mirror device （DMD） willead to the change of the polarization aberration in the system， which willcause a decrease in the accuracy of the polarization measurement of the LWIR polarized optics system， we propose a method for analyzing and compensating for the polarization aberration of the LWIR secondary imaging optical system containing DMD.Firstly， Based on the ratio of wavelength to DMD pixel size in the LWIR polarized optics system， a difraction and polarization aberration characteristic transmission model is constructed and a polarization aberration analysis method based on the Jones vector theory of vector diffraction-polarized light is proposed. Secondly，the polarization aberration and polarizability of DMD are deduced to determine the optimal difraction order，incidence angle and diffraction efciency of DMD，and then the secondary imaging LWIR polarized optics system containing DMD is designed to obtain the influence of DMD difraction characteristics on polarization aberration. Finally，the polarization aberration of the optical system is compensated by tilting the projection objective， coating the lens and reducing the surface incidence angle，so as to solve the influence of difraction phenomenon on the polarization aberration of the LWIR polarized optical system. Simulation results show that the ful-field-of-view modulation transfer function of the system is close to the diffraction limit atthe cut-off frequency， the maximum aberrationis less than 0.2% ，the imaging quality is good， and the two-way attenuation of the whole system is reduced to 1/12 of the original one after compensation.This analytical model can revealthe relationship between diffraction and polarization aberration，and the compensation method can effectively reduce the polarization aberration.
Key Words： long-wave infrared; polarization aberration; optical system design; vector difraction; digital micro-mirror device
1引言
红外成像系统主要通过探测目标的自身热辐射，利用目标与背景的温度差异提取目标。（剩余12773字）