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角分复用数字全息像的相位校正和分辨率改善
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Phase correction and resolution improvement of digital holographic image in numerical reconstruction with angular multiplexing

摘    要
在数字全息术中,为了记录物体不同的空间频率信息以提高再现像分辨率,一种有效的途径是引入角分复用技术,最后由CCD记录一幅包含有多幅子全息图的复合全息图。但多角度照明会引起不同子全息图重建光场之间存在相位倾斜,最终影响合成再现像的质量。针对该问题,本文提出一种相位校正方法。通过理论分析得到两子全息图重建光场之间的相位倾斜因子,再利用一相位校正因子对该相位倾斜进行数字校正,最后将校正后的两物光波场作复振幅叠加,得到两幅子全息图的合成再现像。实验结果表明,最终合成再现像的质量和分辨率均获得明显提高。
标    签 数字全息术   角分复用   相位倾斜   相位校正   分辨率   090.1995   100.2000   100.3010  
 
Abstract
A phase correction method is presented to remove the phase slope of the sub-holograms caused by the multi-direction illumination on object in digital holography. To improve the resolution of the reconstructed holographic images, two sub-holograms are recorded by using angular multiplexing and their phase slope parameter is obtained by theoretical analysis. Introducing a phase correction parameter to this phase slope, the ideal complex reconstructed image can be obtained by superposing the reconstructed object wave fields of the two sub-holograms. Experimental results demonstrate that the resolution of the reconstructed image can be effectively enhanced.

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收稿日期 2009/7/16

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备注This work was supported by the Science Foundation of Aeronautics of China under Grant No. 2006ZD53042.

引用该论文: Xiaobo Yan,Jianlin Zhao,Jianglei Di,Hongzhen Jiang,Weiwei Sun. Phase correction and resolution improvement of digital holographic image in numerical reconstruction with angular multiplexing[J]. 中国光学快报, 2009, 7(12): 1072~1075


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