Random Phase Diffuser Design for Holographic Storage

Abstract

Diffusers have frequently been used in holography to overcome the problem of limited dynamic range in the recording material. The limited dynamic range is even more of a problem when recording the Fourier transform of an image as is done when making matched filters for Vander Lugt-type correlators. A diffuser designed to be used when holographically storing matched filters must spread the energy over the recording material, but not diffuse it so much that information is lost. The key is to design a diffuser whose parameters are dependent on the recording material and not so much on the input.