Multifocal Fresnel lens based on liquid crystal spatial light modulator

XU Zhong-bao; WANG Shuang-ying; LIU Wen-chao; TAO Wei-sen; SONG Cong-shan

doi:10.3788/OPE.20162413.0156

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Multifocal Fresnel lens based on liquid crystal spatial light modulator

更新时间：2020-08-13

- Multifocal Fresnel lens based on liquid crystal spatial light modulator
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 156-161(2016)
- 作者机构：
  
  1. 湖北工业大学机械工程学院,湖北武汉,430068
  2. 湖北省纤维检测局,湖北武汉,430061
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0156
  CLC： O753.2;O439
- Received：28 May 2016，
  
  Revised：15 June 2016，
  
  Published：14 November 2016
- 稿件说明：
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许忠保, 王双迎, 刘文超等. 基于液晶空间光调制器的多焦菲涅尔透镜[J]. 光学精密工程, 2016,24(10s): 156-161

XU Zhong-bao, WANG Shuang-ying, LIU Wen-chao etc. Multifocal Fresnel lens based on liquid crystal spatial light modulator[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 156-161
许忠保, 王双迎, 刘文超等. 基于液晶空间光调制器的多焦菲涅尔透镜[J]. 光学精密工程, 2016,24(10s): 156-161 DOI： 10.3788/OPE.20162413.0156.

XU Zhong-bao, WANG Shuang-ying, LIU Wen-chao etc. Multifocal Fresnel lens based on liquid crystal spatial light modulator[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 156-161 DOI： 10.3788/OPE.20162413.0156.

摘要

为了在保持分辨率的前提下提高传统成像透镜的焦深，提出了一种基于纯相位空间光调制器（PLUTO）的多焦菲涅尔透镜延拓焦深的方法。在分析空间光调制器承载菲涅尔透镜原理及对透镜最小焦距、衍射效率限制因素的基础上，将多个不同焦距的菲涅尔透镜与闪耀光栅镶嵌在一起，并通过Matlab编程在液晶空间光调制器的像素区域。通过PLUTO的像素控制特性，实现多个透镜的相位随机等概率分布在PLUTO的每个像素中。根据每个透镜的轴向焦点相互交叠的原则，获得了焦深为16 mm的复用透镜。实验结果表明，与具有相同数值孔径的单透镜相比，复用透镜的焦深增加了5倍；而且在整个焦深范围内，焦斑大小基本保持不变与单透镜有着相近的成像分辨率。

Abstract

Subject to the restrictive relation between resolution and focal depth of traditional imaging lens

a multi-focal Fresnel lens based on phase-spatial light modulator (PLUTO) was developed for the extension of the depth of focus. Based on the analysis of the restrictions imposed by Spatial Light Modulator (SLM) on principle

minimum focal length and diffraction efficiency of Fresnel lens

the Fresnel lens of different focal lengths combined with the blazed grating were programmed in the pixel region of Liquid Crystal Spatial Light Modulator (LC-SLM) by Matlab. The pixel control characteristics of PLUTO enabled the phases of multiple lenses equiprobably distributed in each pixel of PLUTO. In accordance with the overlapping principle for axial focuses of each lens

the multiplex lens with a focal depth of 16 mm was obtained. Compared with a single lens with the same numerical aperture

the focal depth achieved by the multiplex lens is increased by 5 times. In addition

the focal spot remains in the same size

with approximate imaging resolution to single lens within the whole range of depth of focus.

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references

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Related Institution

School of Physics， East China University of Science and Technology

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