光学技术, 2018, 44 (6): 673, 网络出版: 2019-01-10
基于空间部分相干光的全息图产生与显示
Hologram generation and display based on spatial partially coherent light
计算全息 空间部分相干光 散斑消除 散斑对比度 峰值信噪比 Computer generated holography Partially spatial coherent light Speckle elimination Speckle contrast Peak signal to noise ratio
摘要
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%。
Abstract
Based on the partial coherent light theory, the equivalent expression of partially coherent light in space is dervied, and an algorithm for generating holograms is proposed. The corresponding mathematical model of the expression is built. According to the optical properties of Fraunhofer diffraction, the mathematical model is combined with the angle spectrum theory and the iterative algorithm to propose a feasible algorithm for generating a computational hologram. On this basis, The speckle was further reduced by combining the time average theory. The image quality was evaluated by the speckle contrast ratio and peak signal-to-noise ratio. The theoretical results show that the hologram reconstructed image produced by this algorithm can reduce the speckle contrast by 21.7%.
郝碧宁, 刘娟, 段俊毅, 赵涛, 高乾坤, 段鑫慧, 李昕. 基于空间部分相干光的全息图产生与显示[J]. 光学技术, 2018, 44(6): 673. HAO Bining, LIU Juan, DUAN Junyi, ZHAO Tao, GAO Qiankun, DUAN Xinhui, LI Xin. Hologram generation and display based on spatial partially coherent light[J]. Optical Technique, 2018, 44(6): 673.