离轴自由曲面光学系统偏振像差特性研究

Research on Polarization Aberration Characteristics of Off-Axis Freeform Surface Optical System

针对自由曲面面型所引起的偏振像差对系统的成像质量和测量精度的影响不可忽略,基于琼斯表示法提出含有条纹泽尼克多项式的自由曲面离轴光学系统的偏振像差分析方法,构建自由曲面反射光学系统的偏振像差解析模型,分析条纹泽尼克多项式中Z5和Z6项对视场离轴光学系统偏振像差分布的影响。通过全视场偏振光线追迹验证自由曲面对视场离轴光学系统的相位像差、相位延迟和二向衰减三种偏振像差的作用规律。针对含有自由曲面的大视场离轴三反光学系统进行全视场偏振像差分析。分析结果表明,相位像差分布与自由曲面面型矢高分布一致,二向衰减和相位延迟均为系统总体的50%。

Aiming at the influence of the polarization aberration caused by the freeform surface on the imaging quality and measurement accuracy of the system,the polarization aberration analysis method of the freeform off-axis optical system with fringe Zernike polynomial is proposed based on Jones representation,and an analytical model of polarization aberration for freeform reflection optical system is constructed,and the effects of Z5 and Z6 in fringe Zernike polynomials on the polarization aberration distribution of off-axis field of view optical systems are analyzed.Through the tracing of the polarized light in the full field of view,it is verified that the freeform surface acts on the three polarization aberrations of the field of view off-axis optical system,such as phase aberration,diattenuation,and retardance.A full-field polarization aberration analysis is carried out for a large field of view off-axis three-mirror optical system with freeform surfaces.The analysis results show that the phase aberration distribution is consistent with the vector height distribution of the freeform surface,and the two-direction attenuation and phase delay are 50%of the total system.