Reduction of speckle noise in digital holography by using of multiple holograms

In this paper, a method of reduction speckle noise in digital holography is presented. This method can suppress the speckle noise effectively. First, a series of digital holograms are recorded with different titled plane wave illuminations. Then each of the complex amplitude is reconstructed. The speckle noise is suppressed by incoherent superposition of the reconstructed intensity image fields. One of the advantages of this method is that the procedure is very simple and effective. We make computer simulation by applying Fresnel transform algorithm and multiple reconstructed intensity images of a picture with different titled plane wave as illuminating object light. The simulation results show that the more the superposition of reconstructed intensity images, the better the reduction of speckle noise. And it also demonstrates the validation of the present method.