Improvement of Scheimpflug systems with freeform surfaces

Applied Optics
Yi Zhong, Herbert Gross

Abstract

It is well known that freeform surfaces are used to improve the resolution in systems without rotational symmetry. For Scheimpflug systems, the tilted object plane leads to variant magnification in the system imaging. Thus, the system suffers from non-rotationally symmetric aberrations, non-uniform resolution, and non-uniform intensity distribution. In this paper, the paraxial imaging condition of Scheimpflug systems is discussed. From the classical viewpoint, the aberration theory is used to understand, balance, and improve the system performance for variant object distance. For large object distance shift, it is necessary to apply freeform surfaces. With the initial system design method based on Gaussian brackets, the starting configuration of a Scheimpflug system with large object distance shift is obtained. Based on the extension of the Nodal aberration theory concerning the aberrations of freeform surfaces, the rules of selecting the freeform surface position in the system are introduced. By adding two freeform surfaces far away from the pupil, the aberrations are effectively corrected in the Scheimpflug system. The aberrations along the field are decomposed and represented using Zernike fringe polynomials to show the impr...Continue Reading

References

Aug 14, 2013·Optics Express·Antonin MiksPavel Novak
Sep 15, 2015·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Tong YangGuofan Jin

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Citations

Aug 16, 2018·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Yi Zhong, Herbert Gross
Mar 4, 2020·Optics Express·Yi ZhongHerbert Gross

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