Abstract

A holographic 3-D disk consists of a disk-shaped holographic medium and a recording/read-out head. The head moves in the radial direction while the disk rotates to allow access to any location on its surface. Multiple holograms are stored at each location using a plane wave reference and either angle or wavelength multiplexing [1]. Disks can also be constructed using peristrophic [2] or phase-code multiplexing [3]. No matter which of the above methods is used, the multiplexing mechanism must be incorporated in the head along with the CCD, SLM, and passive optical components. In this paper we present a multiplexing method, shift multiplexing[4], which allows holograms to be superimposed at one location using only the rotation of the disk. Since the mechanical system to rotate the disk is already in place, this multiplexing method is well suited for the disk configuration. In addition, access to the data, is more natural in the shift mode because the continuous disk motion is easily combined with successive hologram read-out.

© 1995 Optical Society of America