单波长激光记录三维物体彩色反射全息图

银盐全息干版的乳胶收缩将导致其记录的反射全息图再现光的波长漂移.利用这一效应,提出一种记录彩色反射全息图的新方法.首先,利用三原色激光(632.8 nm,514.5 nm,488 nm),记录彩色物体的菲涅耳全息图,以此得到彩色物体的三原色分色像;然后利用单色光(632.8 nm)分别再现3个分色像,并在单色全息干版上记录其反射全息图,并分别对3个反射全息图进行不同的收缩处理,使其再现波长漂移到记录时的三原色波长;最后将3个反射全息图叠合形成夹层全息图即可再现出彩色像,并进行了实验验证.

The three-dimensional color reflection hologram recorded with a single wavelength

Drift of reconstructing wavelength of volume holograms may occur because of the emulsion shrink of silver salt holographic plate.Using this effect, we developed a new method to make color reflection holograms. Firstly, the trichromatic images of color object are separated using three Fresnel holograms with trichromatic laser wavelengths (632.8 nm, 514.5 nm and 488 nm).Then,three homochromy images are reconstructed from three Fresnel holograms with the same wavelength ((632.8 nm)) and are recorded again in three reflection holograms.We processed the three reflection holograms differently in order that their Bragg wavelengths drift to trichromatic wavelengths.Finally, the three holograms are superposed to form a sandwich hologram.This hologram can be used to reconstruct a color image of the original object.