用一幅离轴菲涅耳数字全息图重建物光波的局域算法研究

Reconstruction Algorithm of Object Wave-front from Single Off-axis Fresnel Digital Hologram

基于对离轴菲涅耳全息干涉条纹强度分布的分析,根据CCD记录数据的特点研究了从一幅全息图重建物光波波前、再现物体像的一种新方法.以记录面上某一点(CCD靶面上某一像元)为中心取一个小邻域,假设在该邻域内参考光的振幅、物光的振幅和相位是慢变化的,全息图的强度变化仅是由倾斜入射的参考光的相位变化引起的,从而可用最小二乘法构建一个线性方程组,通过求解该方程组可求得该点物光波的振幅和相位.文中给出了该方法的基本思想和理论分析,并通过计算机模拟和初步的光学实验,验证了该方法的正确性和有效性.

A novel method for reconstructing object wave-front from a single digital Fresnel off-axis hologram is studied, which is based on the analysis of the intensity distribution of Fresnel off-axis hologram and the data recording characteristic of CCD sensor. The fundamental idea and theoretical analysis of the method are described, and the correctness and validity of this method are demonstrated with the results of both computer simulation＇and optical experiment.