Abstract

Several optical computing and interconnection architectures have been demonstrated which rely on storing multiple-exposure holograms in volume photorefractive media. In addition, photorefractive materials are used as storage media for optical associative memories and adaptive neurallike networks. One potential problem with these materials is that holograms stored with equal energies reconstruct images with unequal brightness. Holograms recorded later in a multiple-exposure reconstruct brighter than holograms recorded earlier in the superimposition. Staebler et al.¹ showed that the diffraction efficiency of the 100th hologram stored and fixed in a multiple-exposure recording in Fe-doped LiNbO₃ reconstructed four times as bright as the tenth hologram recorded in the superimposition. Trial and error attempts to compensate for this effect resulted in an order of magnitude difference in brightness between the first and last reconstructed images.

© 1988 Optical Society of America