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由于数字全息图受到激光散斑影响,使得其再现像产生较为严重的噪音。通过详细分析激光散斑形成的原因,并提出了用同一物体的多幅全息图的强度再现像叠加来减小激光散斑的干扰。具体分析了该方法的原理：在记录全息的物体照明光路中加入一散射体,在散射体的M个不同位置记录M张同一物体的全息图,然后将M幅数字全息的再现像叠加,激光散斑噪音下降为M~(-1/2)。最后给出了实验结果。
Because digital holograms are affected by laser speckles, their reproduced images produce more severe noise. By analyzing the causes of the laser speckle formation in detail, the interference of the laser speckle reduction by the superposition of the intensities of multiple holograms of the same object is proposed. The principle of this method is analyzed in detail. By adding a scatterer in the illumination path of the holographic object, M holograms of the same object are recorded in M different positions of the scatterer, and the reconstructed images of M digital holograms are superimposed. The laser The speckle noise is reduced to M ~ (-1/2). Finally, the experimental results are given.