基于部分相干光理论, 推导了空间部分相干光的等效表达式, 提出一种产生全息图的算法。算法根据推导的空间部分相干光表达式建立相应的数学模型, 且根据夫琅禾费衍射的光学性质, 将数学模型与角谱理论和迭代算法相结合; 在此基础上, 结合时间平均理论进一步降低散斑。通过散斑对比度和峰值信噪比进行图像质量评价, 理论结果表明: 所提算法产生的全息图再现图像可以将散斑对比度降低21.7%。

基于微机电系统(MEMS)微加工技术和Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT)电光材料设计的一维二进制码相位调制器(1D-BPM)可用于激光显示技术中的散斑消除。建立了1D-BPM数学模型，推导出电极在PMN-PT片内产生的电场和PMN-PT折射率变化导致通过的光束相位变化的关系。采用有限元分析方法仿真了电极几何尺寸对相位的影响,发现当电极尺寸在亚微米级时，两电极间相位分布不仅依赖于电极产生的电场大小，而且受到电极几何尺寸的影响。电极角效应是器件设计及优化时需考虑的重要因素。

An approach for synthetic aperture radar (SAR) image de-noising based on independent component analysis (ICA) basis images is proposed. Firstly, the basis images and the code matrix of the original image are obtained using ICA algorithm. Then, pointwise Holder exponent of each basis is computed as a cost criterion for basis enhancement, and then the enhanced basis images are classified into two sets according to a separation rule which separates the clean basis from the original basis. After these key procedures for speckle reduction, the clean image is finally obtained by reconstruction on the clean basis and original code matrix. The reconstructed image shows better visual perception and image quality compared with those obtained by other traditional techniques.