同轴菲涅耳全息中提取相位的算法

同轴全息术得到的相位通常都有弯曲和畸变，且0级和±1级再现像相互重叠，使得以往在离轴全息中常用的相位补偿处理技术在同轴菲涅耳全息中效果不佳。为了解决该问题，采用一种仅需拍摄一幅同轴菲涅耳数字全息图，对该全息图做必要处理得到另一幅全息图，通过将两幅全息图的衍射再现光场相减消除相位弯曲，以及0级像和矩孔衍射对相位的影响，从而提取待求光场相位近似值的方法，进行了相应的理论推导和实验验证。结果表明，该算法相较以往使用的相位掩膜方法能够得到更好的结果。

Phase retrieval method of in-line Fresnel digital holography

Besides the aberration, the overlapping with 0th and ±1st images observed in the phase distribution is difficult to deal with, which is different from the phase compensation methods adopted in off-axis setup. A method was proposed to get the phase information from a single in-line Fresnel digital holography. By subtracting recoded hologram by a numerical hologram, effect of the phase curve, the 0th image and the diffraction of the rectangular aperture was eliminated. The phase can be retrieved. The theoretical analysis and the experimental results were presented. It is found that better phase result can be obtained than former digital phase mask method.