Pal Sourav
Department of Applied Optics and Photonics, University of Calcutta, Kolkata, India.
Appl Opt. 2013 Aug 10;52(23):5724-32. doi: 10.1364/AO.52.005724.
A systematic approach for the aberration correction of zoom systems is presented. It is assumed that the powers and movements of the components of the zoom systems are known. Each component is considered as a system of thin lenses in contact. An evolutionary algorithm is developed to explore the multivariate hyperspace of design variables formed by spherical aberration, central coma, and longitudinal chromatic aberration of each component for infinite conjugate. The primary aberrations for each component at any zoom position are deduced from three central aberration coefficients of the component for infinite conjugate using conjugate shift formulas. Overall system aberrations of the zoom systems are determined by using stop shift formulas. In most of the zoom lens systems it is important to achieve stability in the primary aberrations of the system over the zoom range. This is facilitated by proper formulation of the merit function for the optimization process. Investigations have been carried out on four-component zoom lenses, and an ab initio structure of a four-component zoom lens is presented.
提出了一种变焦系统像差校正的系统方法。假设变焦系统各组件的光焦度和移动情况已知。每个组件都被视为薄透镜接触系统。开发了一种进化算法，以探索由每个组件在无限共轭时的球差、中心彗差和纵向色差形成的设计变量多元超空间。利用共轭变换公式，从组件在无限共轭时的三个中心像差系数推导出任何变焦位置处每个组件的初级像差。变焦系统的整体系统像差通过使用光阑变换公式来确定。在大多数变焦透镜系统中，在变焦范围内实现系统初级像差的稳定性很重要。这通过为优化过程正确制定评价函数来实现。对四组件变焦透镜进行了研究，并给出了一种四组件变焦透镜的初始结构。
