Multifocal Fresnel lens based on liquid crystal spatial light modulator

被引：0

作者：

Xu Z.-B. ^{[1
]}

Wang S.-Y. ^{[1
]}

Liu W.-C. ^{[1
]}

Tao W.-S. ^{[1
]}

Song C.-S. ^{[2
]}

机构：

[1] School of Mechanical Engineering, Hubei University of Technology, Wuhan

[2] Hubei Province Fibre Inspection Bureau, Wuhan

来源：

Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2016年 / 24卷

关键词：

Diffraction efficiency; Extended focal depth; Fresnel lens; Multiplexing multifocal lens; Spatial light modulator;

D O I：

10.3788/OPE.20162413.0156

中图分类号：

学科分类号：

摘要：

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. © 2016, Science Press. All right reserved.

引用

页码：156 / 161

页数：5

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