Accession Number : ADA320929

Title :   Holographic Random Access Memories.

Descriptive Note : Final rept. Nov 92-Dec 95,

Corporate Author : NORTHROP GRUMMAN CORP HAWTHORNE CA ELECTRONICS AND SYSTEMS INTEGRATION DIV

Personal Author(s) : Raffensperger, Susan

PDF Url : ADA320929

Report Date : JUL 1996

Pagination or Media Count : 19

Abstract : This program, originally proposed in early 1991 and eventually funded in late 1992, represented a pioneering effort to demonstrate, using only commercially available components and proven technologies, the technical feasibility of 3-D holographic memories. Building on work done at Northrop, which indicated that relatively high data storage densities (gigabit/cubic cm) could be achieved in iron doped lithium niobate and on novel architectural concepts developed jointly by Northrop and California Institute of Technology, the objectives of this program were to show that: (1) by using a combination of spatial and angle multiplexing techniques, storage terabits could eventually be achieved within 100 cubic cm iron-doped lithium niobate; (2) random access times of less than 10 microsec could be achieved by using non-mechanical (acoustooptic) reference beam scanning techniques; and (3) adequate, if not optimal, SLMs and CCD arrays were not available. The above objectives were to be achieved using a WORM (write once/read many times) memory architecture that circumvented, to the greatest extent possible, the recognized read write sensitivity limitations of iron doped lithium niobate.

Descriptors :   *RANDOM ACCESS COMPUTER STORAGE, *THREE DIMENSIONAL, *HOLOGRAPHY, SCANNING, ANGLES, COMPUTER ARCHITECTURE, READ WRITE MEMORIES, MEMORY DEVICES, FEASIBILITY STUDIES, HIGH DENSITY, DATA STORAGE SYSTEMS, ACCESS TIME, ARCHITECTURE, MULTIPLEXING.

Subject Categories : Computer Hardware
      Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE