基于位相分布限制衍射光学元件的散斑抑制方法

发布时间：2017-12-28 14:00

本文关键词：基于位相分布限制衍射光学元件的散斑抑制方法　出处：《光子学报》2017年01期 　论文类型：期刊论文

【摘要】：根据散斑产生的机理,利用像素点之间干涉的概念,提出了通过限制光场的位相分布范围来抑制投影图像中散斑对比度的方法.在部分发展散斑的条件下,推导了位相均匀分布情况下的散斑对比度公式,揭示了当相位分布范围在0.6π~2π之间时,散斑对比度随相位分布范围的变化而震荡变化,当把相位分布范围限制在0.6π以下时,散斑对比度会随相位分布范围的减小而迅速下降.建立了理想仿真模型和实际仿真模型来验证该方法的正确性和可行性.在理想仿真模型中,当位相分布范围从2π变到0,所得散斑图样对比度从66.44%降到0;在实际仿真模型中,模拟了实际激光投影系统的光路结构,并运用了两片衍射光学元件,一片用于激光整形匀化,一片用于光场的位相分布范围限制,散斑图样对比度从92.78%降低到2.09%.该方法稳定性高、耗能低、使用元件尺寸小,为全息投影显示的散斑抑制提供了参考.
[Abstract]:According to the mechanism of speckle produced by using the concept of interference between pixels, the phase distribution of the light field by limiting the range of methods of suppressing speckle contrast projection image. In the part of the development of speckle is deduced under the condition of phase under the uniform distribution of the speckle contrast formula, revealed when phase the distribution in the range between 0.6 Pi Pi ~2, speckle contrast variations with the phase distribution of the shock changes when the phase distribution range is limited to 0.6 PI when the speckle contrast will decrease with the phase distribution range decreased rapidly. To establish the correctness and feasibility of the ideal simulation model and simulation a model to verify the method. In the simulation model, the phase distribution range from 2 to 0 PI, the speckle contrast is reduced from 66.44% to 0; in the actual simulation model, simulation of the optical path of the actual laser projection system. Structure, and use two pieces of diffractive optical element for a laser shaping, for a phase distribution limit of the light field, the speckle contrast is reduced from 92.78% to 2.09%. the method of high stability, low energy consumption, the use of a small element size, provide a reference for speckle suppression of holographic projection display.
【作者单位】：中国科学院长春光学精密机械与物理研究所超精密光学工程研究中心;中国科学院大学;
【基金】：国家高技术研究发展计划(No.2015AA033201)资助~~
【分类号】：O436.1
【正文快照】： 0 引言激光以其高亮度、高准直性和高相干性等优异特性,被广泛应用于工业、军事、通信等领域.同时,在投影显示方面,相比于传统显示技术,激光显示具有高饱和度、大色域、高亮度、低能耗及长寿命等优点,被业界认为是下一代显示系统的主流光源[1-2].然而,由于激光光源的高度相

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