Accession Number : ADP006737

Title :   Dynamic Photorefractive Optical Memories.

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERIN G

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : The extremely large storage density of volume holographic memories is applicable to numeric and neural network optical computing. Such photorefractive memories, can be used to provide optical storage of binary bit-plane or gray scale images as well as weighted interconnects for optical digital and neural network computing. However, success in applying optical memories to computing will strongly depend not only on the memory's large capacity and short random access time, but also on the memory's dynamic characteristics. Our objective is to construct a dynamic photorefractive memory that provides (1) nondestructive readout, i.e., after a large number of readings, the memory can be refreshed by rewriting the still useful information from one crystal into another, and (2) write/erase capability, that is, while rewriting the useful part of the information from one crystal to the other, we can also replace some of the old information that must be erased by the new information introduced from the input to the memory.

Descriptors :   *OPTICAL STORAGE, *HOLOGRAPHY, *MEMORY DEVICES, ACCESS, ACCESS TIME, CRYSTALS, DENSITY, GRAY SCALE, IMAGES, INPUT, STORAGE, VOLUME, NEURAL NETS, OPTICAL IMAGES, AMPLIFIERS, SYMPOSIA.

Subject Categories : Optics
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE