全息光存储双波长非球面光学头物镜设计  

Design of two-wavelength aspherical optical lens for holographic storage

作　　者：文静[1] 杨冠东 韦晓孝 徐学科 陶春先[1] WEN jing;YANG guandong;WEI xiaoxiao;XU xueke;TAO chunxian(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Heng Mai Optics and Fine Mechanics(Hang Zhou)Co.,Hangzhou 311421,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]恒迈光学精密机械(杭州)有限公司,浙江杭州311421

出　　处：《光学技术》2023年第3期281-285,共5页Optical Technique

基　　金：国家重点研发计划(2018YFA0701800);国家自然科学基金(NSFC,62175153);上海理工大学专业学位研究生实践基地项目。

摘　　要：全息光存储是一种利用全息方式去进行信息的记录和再现的存储方式。在同轴全息光存储中,需要光学头物镜对532nm和650nm两个工作波长聚焦于全息材料不同的焦面上,且都能达到良好的聚焦效果。由于记录和读取都在全息记录材料上,全息材料由保护层和记录层组成,由于折射率不均匀导致的像差会对物镜的聚焦效果产生影响。目前的商业物镜无法满足全息光存储中光学头的物镜需求。为了满足这类需求,达到良好的性能效果,论文利用Zemax OpticStudio光学设计软件设计了一款针对全息光存储的双波长非球面光学头物镜,整体由一片非球面镜和一片球面镜组成。工作波长为532nm和650nm两个波长,焦距大于4mm小于6.2mm,像方数值孔径大于0.5,MTF值在空间频率为900lp/mm内均大于0.4,在全息材料上聚焦获得的波面相差均方根低于0.07波长。在上述技术指标下,该物镜具有较好的分辨能力和成像质量,论文方案为全息光存储光学头物镜的设计提供了新的思路。The objective lens of the optical pickup is widely used in optical storage systems.Holographic optical storage uses holography to record and reconstruct information for storage purposes.The objective lens used in this process requires a high resolution and the commercially available objective lenses do not meet the requirements.Since both recording and reading are on the holographic recording material,the refractive index and thickness of the holographic material will impact the resolution and focusing efficiency of the objective lens."Dual beam holographic optical storage"requires an objective lens of the optical pickup with high resolution and focusing efficiency in the dual working wavelengths mode of the beam.In order to fulfill such requirements,this study demonstrates the design of a dual-wavelength aspheric objective lens of optical pickup for holographic optical storage which is composed of an aspherical and spherical mirror by using the Zemax OpticStudio.The two working wavelengths are 532nm and 650nm and the focal length is greater than 4mm but less than 6.2mm.The numerical aperture is greater than 0.5,the MTF is greater than O.4 within the spatial frequency of 9oolp/mm,and the root means square of the wave surface difference obtained by focusing on the holographic material is less than O.O7a.Regarding the above technical indicators,the designed objective lens has a high resolution and imaging quality.This design provides a new idea for the design of holographic optical storage lens.

关 键 词：光学设计 非球面 全息光存储 

分 类 号：O435.2[机械工程—光学工程] O439[理学—光学]