Compact Holographic Memory
Using E-0 Beam Steering
Tien-Hsin Chao
(81 8)354-8614 Tien-Hsin.Chaoi&iol.nasa.nov
Hanying Zhou
(8 1 S)354-0502 Hanving.Zhou~ioI.nasa.nov
George Reyes
(8 18)393-4820 GeorPe.F.Rcvcs~;ipI.nasa.go~
Jay Hanan
(8 18)354-8614 JavhananCdca1tech.edu
Jet Propulsion Laboratory
4800 Oak Grove Dr. Pasadena, Ca 91 109
A b s t r a c t 4 1 1 innovative holographic memory system
has been developed at JPL for high-density and high-
speed data storage in a space environment. This system
utilizes a newly developed electro-optic (E-0) beam
steering technology for beam steering to enable high-
speed random access memory readwrite without moving
parts. Recently, a compact CD-sized holographic memory
breadboard has been developed and demonstrated for
holographic data storage and retrieval. Detail technical
progress will be presented in this paper.
TABLE OF CONTENTS
1. NTRODUCTION
2. HOLOGRAPHIC MEMORY SYSTEM
ARCHITECTURE
SCHEME
MODULATOR
MEMORY BREADBOARD
3. 2-D ANGULAR-FRACTAL MULTIPLEXING
4. BEAM STEERING SPATIAL LIGHT
5. CD-SIZED COMPACT HOLOGRAPHIC
6. SUMMARY
7. ACKNOWLEDGMENTS
8. REFERENCES
1. INTRODUCTION
JPL, under current sponsorship from NASA Earth Science
Technology Office, is developing a high-density,
nonvolatiIe d Compact holographic memory (BM) system
to enable large-capacity, high-speed, low power
consumption, and readlwrite of data for potential
commercial and NASA space applications [l-41. This HM
consists of laser diodes, photorefractive crystal, spatial
light modulator, photodetector array, and I/O electronic
interface. In operation, pages of information would be
recorded and retrieved with random access and high-
speed. The nonvolatile, rad-hard characteristics of the
holographic memory will provide a revolutionary memory
technology to enhance the data storage capability for all
NASA s Earth Science Missions. In this paper, an
innovative holographic memory technology developed at
JPL will be presented. The system architecture, key
device