数字全息再现像的激光散斑消除的研究  

Reduction of speckle noise in digital holography

作　　者：田青[1] 王辉[1] 任志君[1] 

机构地区：[1]浙江师范大学信息光学研究所,浙江金华321004

出　　处：《应用激光》2006年第6期439-442,共4页Applied Laser

基　　金：国家自然科学基金(60477039)资助

摘　　要：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。As digital holography is influenced by the laser speckle noise, the reconstructed image of digital hologram is seriously ruined by the noise. Based on the cause of laser speckle, a technique of superpesition on an intensity basis of digital reconstructed images of the same static object is proposed,whlch achieves the aim of reducing speckle. The theory is discussed in detail： a diffuser is placed in the optical setup,and M holograms are obtained in the M different positions of the dlffuser,and then the M reconstructed images are added on an intensity basis, at last the speckle noise is reduced from 1 to M^-1/2. The experiment results are given in the end.

关 键 词：数字全息 激光散斑 散射体 三维重构 

分 类 号：TN247[电子电信—物理电子学]