A Study on Focal Depth characteristic of Hybrid Refractive-Diffractive Element with Long Focal Depth

Hui Zhang; Xuemei Ding; Tan Jiubin

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A Study on Focal Depth characteristic of Hybrid Refractive-Diffractive Element with Long Focal Depth

Article | 更新时间：2020-08-12

- A Study on Focal Depth characteristic of Hybrid Refractive-Diffractive Element with Long Focal Depth
- Optics and Precision Engineering Vol. 16, Issue 1, Pages: 64-70(2008)
- 作者机构：
  
  哈尔滨工业大学超精密光电仪器工程研究所北京空间机电研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 June 2007，
  
  Revised：15 July 2007，
  
  Published Online：22 January 2008，
  
  Published：22 January 2008
- 稿件说明：
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张慧,丁雪梅,谭久彬. 折-衍混合长焦深光学元件焦深特性分析[J]. 光学精密工程, 2008,16(1):64-70

Hui Zhang, Xuemei Ding, Tan Jiubin. A Study on Focal Depth characteristic of Hybrid Refractive-Diffractive Element with Long Focal Depth[J]. Optics and precision engineering, 2008, 16(1): 64-70.
张慧,丁雪梅,谭久彬. 折-衍混合长焦深光学元件焦深特性分析[J]. 光学精密工程, 2008,16(1):64-70 DOI：

Hui Zhang, Xuemei Ding, Tan Jiubin. A Study on Focal Depth characteristic of Hybrid Refractive-Diffractive Element with Long Focal Depth[J]. Optics and precision engineering, 2008, 16(1): 64-70. DOI：

摘要

为明确长焦深元件的焦深扩展倍数及焦深内轴向光强分布特点与系统结构及参数间的关系，分析了基于能量守恒法获得的对数光锥位相函数的特点，建立了长焦深元件焦深与系统f/#及衍射元件浮雕深度间的函数关系，基于菲涅耳衍射公式分析了不同参数时元件的轴向光强分布规律。仿真结果表明：在给定波长及焦距的条件下，折-衍混合长焦深元件相对同f/#的球面折射透镜的焦深扩展倍数取决于衍射元件的浮雕深度，其值越大，焦深扩展倍数越大，焦深内轴向光强分布越接近平顶分布；焦深一定时，小f/#系统更易获得焦深内轴向光强的平顶分布。

Abstract

In order to know the ability of the hybrid refractive-diffractive element for extending focal depth

the logarithmic phase function based on uniform-intensity principle is analyzed and the relationship is set up between focal depth

optical f/# and fabrication parameters of the hybrid refractive-diffractive element with logarithmic phase function. The simulation analysis of on-axis intensity distribution of the element is performed based on Fresnel diffraction formula with different parameters. Simulation results indicate that for determinate focal length and wavelength

the factor in focal depth compared with same f/# spherical refractive lens is determined by profile depth of diffractive element: when the profile depth is increased

the factor is larger and the on-axis intensity distribution in focal depth offers great uniform characters. For determinate focal depth value

when the optical f/# is decreased

the uniform character of on-axis intensity distribution in focal depth is better.

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College of Physics and Electronic Information, Wenzhou University

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