Abstract

We propose optical discs that store data holographically in three dimensions by combining multiplexing techniques and multilayer storage. Microholograms can be stored overlapping in the same volume by using angle multiplexing, wavelength multiplexing or the combination of both. Storage of multiple information bits in one single position on the disc increases the data rates and the storage capacity can reach more than 100 Gbytes /1/. In contrast to previous holographic storage systems, the storage media are made of cheap and mass-produceable photopolymer layers instead of expensive crystals. Furthermore, the microholographic storage method can be downward compatible with today's Compact-Disk (CD)- and Digital-Versatile-Disk (DVD)-systems.

© 1998 Optical Society of America