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根据可变放大率物光波前重建过程中球面波照射下数字全息图频谱的分析,提出在重建波照射前对全息图进行高通滤波消零级衍射干扰的方法。对物体表面为散射及非散射面情况的波前重建进行理论模拟及实验研究。结果表明,当物体表面是散射面时,可以获得有效消除干扰的重建图像,但是,当物体表面是光学平滑表面时,为得到完整的重建图像,要求将更为严格。
According to the analysis of the digital hologram spectrum under the spherical wave irradiation during reconstruction of variable magnification optical wavefront, a method of high-pass zero-order diffraction interference on the hologram before reconstruction is proposed. The wavefront reconstruction of scattering and non-scattering surfaces on the object surface is theoretically simulated and experimentally studied. The results show that when the surface of the object is a scattering surface, a reconstructed image can be obtained which can effectively eliminate the interference. However, when the surface of the object is an optically smooth surface, the requirements will be stricter in order to obtain a complete reconstructed image.