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.
© 2009 Chinese Optics Letters
Xiaobo Yan, Jianlin Zhao, Jianglei Di, Hongzhen Jiang, and Weiwei Sun, "Phase correction and resolution improvement of digital holographic image in numerical reconstruction with angular multiplexing," Chin. Opt. Lett. 7, 1072-1075 (2009)