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1.浙江工业大学 理学院,浙江 杭州 310023
2.杭州谱育科技发展有限公司,浙江 杭州 311121
[ "段祥瑞(2000-),男,河南平顶山人,学士,2022年于浙江工业大学获得学士学位,主要从事微结构光电子器件及其探测和成像系统方面的研究。E-mail: 2460098088@qq.com" ]
[ "乐孜纯(1965-),女,浙江杭州人,教授,博士生导师,1987年于浙江大学获得学士学位,1998年于中国科学院长春光学精密机械研究所获得博士学位,曾在英国牛津大学、韩国全南国立大学、德国比勒菲尔德大学交流和工作,现为浙江工业大学光学工程研究所所长,主要从事微结构光电子器件及其探测和成像系统方面的研究。E-mail:lzc@zjut.edu.cn" ]
收稿日期:2022-08-17,
修回日期:2022-10-30,
纸质出版日期:2023-02-25
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段祥瑞,费澳鑫,卢智易等.履带式运动柔性衍射光学器件抑制激光散斑及其耐久性实验[J].光学精密工程,2023,31(04):459-469.
DUAN Xiangrui,FEI Aoxin,LU Zhiyi,et al.Tracked motion flexible diffractive optical elements suppressing laser speckle and its durability test[J].Optics and Precision Engineering,2023,31(04):459-469.
段祥瑞,费澳鑫,卢智易等.履带式运动柔性衍射光学器件抑制激光散斑及其耐久性实验[J].光学精密工程,2023,31(04):459-469. DOI: 10.37188/OPE.20233104.0459.
DUAN Xiangrui,FEI Aoxin,LU Zhiyi,et al.Tracked motion flexible diffractive optical elements suppressing laser speckle and its durability test[J].Optics and Precision Engineering,2023,31(04):459-469. DOI: 10.37188/OPE.20233104.0459.
为了有效抑制激光散斑,真正实现激光显示和成像系统的大色域、高亮度和超优画质,提出了基于履带式运动柔性衍射光学器件(Diffractive Optical Elements, DOE)的散斑抑制方法,对柔性衍射光学器件的设计、制造、耐久性和散斑抑制效果进行了研究。首先设计了柔性衍射光学器件的光学结构,并描述了履带式运动柔性衍射光学器件形成动态二维衍射编码的机理;接下来介绍了柔性衍射光学器件的模板制备、热压成型、连接成环的工艺方法;之后搭建激光投影显示系统对所研制的聚氯乙烯(Polyvinyl Chloride, PVC)和聚丙烯(Polypropylene, PP)两种材料的柔性衍射光学器件的散斑对比度和耐久性进行实验研究。实验结果表明,提出的基于履带式运动柔性衍射光学器件的激光散斑抑制方法,可将红绿蓝三色激光的散斑对比度降低到5%以下,同时系统具有小型化、低功耗的优点。在长达三十天的耐久性实验中,聚氯乙烯和聚丙烯两种材料的柔性衍射光学器件都没有明显形变和散斑抑制效果的衰减,且PP材料柔性DOE比PVC材料柔性DOE散斑抑制效果更明显、耐久性也更好。满足大色域、高亮度、超优画质的要求,并具有小型化、低功耗、高可靠的优点。
To effectively suppress laser speckle and truly achieve a large color gamut, high brightness, and excellent picture quality of laser display and imaging systems, a speckle suppression method based on tracked motion flexible diffractive optical elements (DOEs) is proposed and demonstrated. The design, manufacture, durability, and speckle suppression effect of the flexible DOE loop are studied. First, the optical structure design of the flexible DOE is presented, and the mechanism of dynamic two-dimensional diffraction encoding by the tracked moving flexible DOE loop is described. Next, the preparation of the working stamper, hot pressing, and ring-joining processes of the flexible DOE loop are introduced. A laser projection system was set up to test speckle contrast and durability of flexible DOEs composed of polyvinyl chloride (PVC) and polypropylene (PP). The experimental results show that the proposed laser speckle suppression method based on a flexible DOE loop with tracked motion has the advantages of lower speckle contrast, smaller size, and lower power consumption. The speckle contrast can be reduced to less than 5% for red, green, and blue lasers. During the 30 day experiments, the PVC and PP flexible DOE loops did not have evident deformation and attenuation of the speckle suppression effect. Furthermore, the PP flexible DOE loop had a more apparent and improved durability compared with the PVC flexible DOE loop. The proposed method satisfies the requirements of large color gamut, high brightness, and excellent picture quality and has the advantages of miniaturization, low power consumption, and high reliability.
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