Study of color digital holography of large size object with zero-order elimination

Abstract

In this paper a method of numerical recording and reconstruction a large size color holographic image by using of angular spectrums diffraction equation is presented. At first, the digital hologram of large size color object which is illuminated with differently wavelengths (red, green, blue) is recorded by a black-white CCD. Then each monochromatic holographic image is reconstructed with the same magnification, and the corresponding digital color holographic image is acquired by accurately synthesizing the reconstructed monochromatic images. In order to record the hologram of large size object, a negative lens is used; and wave-front of reduced image of object is recorded by CCD. At the same time, a good reconstruction image is achieved by eliminating zero-order image with Liquid crystal spatial light modulator (LC-SLM). The experimental results demonstrated that the method presented in this paper can preserve the high frequency information of the object very well, thus can significantly improve reconstruction image quality.