Refraction-reflection Cassegrain telescope system and polarization aberration correction method thereof

Abstract

The invention provides a Cassegrain telescope system and a polarization aberration correction method thereof. The method comprises the following steps: S1, fitting the surface types of a first aspherical reflector and a second aspherical reflector through optical design software according to the design demands; S2, adding a lens group into optical design software, performing ray tracing on the telescope system by constructing an evaluation function for limiting wave aberration, and correcting the wave aberration of the telescope system; S3, constructing and adding a polarization bi-directional attenuation evaluation function f in the evaluation function for limiting the wave aberration, and performing ray tracing on the telescope system again; and S4, optimizing the evaluation function of the limiting wave aberration after the polarization bi-directional attenuation evaluation function f is added, so that the geometric aberration and the polarization aberration of the telescope system meet design requirements. By using the method provided by the invention to calibrate the polarization aberration, the polarization crosstalk energy in the full view field can be reduced by 9.7-63.5%, and the bidirectional attenuation value can be reduced by 40%.

Description

technical field [0001] The invention belongs to the technical field of optical design, and in particular relates to a catadioptric Cassegrain telescope system and a polarization aberration correction method thereof. Background technique [0002] The image distribution of the point spread function (PSF) has an important influence on the image resolution, and the optical surface not only modulates the wavefront of the light, but also modulates the polarization state of the light. The wavefront aberration of high-precision imaging optical instruments (such as astronomical telescopes) depends not only on geometric aberrations and scalar wave diffraction, but also on polarization aberrations caused by the polarization characteristics of light reflected and refracted on optical surfaces in physical optics. However, scalar wave aberration is still the aberration that has the greatest impact on the imaging quality of optical systems, so that in the first forty years of computer-aide...

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Problems solved by technology

[0015] In the existing method, it is proposed to change the relative position of the lens and design the reflective film to reduce the polarization aberration, but it is difficult to design the reflective film with high reflectivity and low polarization aberration at the same time, and the manufacturing cost increases

[0016] Chipman proposed that the polarization aberration caused by the two-way attenuation caused by the system composed of isotropic optical media is mainly composed of diattenuation piston, diattenuationtilt and diattenuation defocus by Taylor expansion of the low-order polarization aberration, and proposed the polarization The formula for calculating the energy crosstalk caused by aberration, but does not use the lens group to correct the polarization aberration caused by the mirror

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