Holographic Memory
CONTENTS
1) INTRODUCTION
2) A) CONCEPT OF HOLOGRAPHY
B) HISTORICAL ROOT
C) WHAT IS HOLOGRAM
3) HOLOGRAOHIC MEMORY
4) TECHNIQUE FOR STORING DATA ON A HOLOGRAPHIC MATERIAL
5) SPATIAL LIGHT MODULATOR
6) MULTIPLEXING
TECHNIQUE FOR RETREIVING DATA FROM A HOLOGRAOHIC
MATERIAL
8) ERROR CORRECTION
9) TECHNICAL SPECIFICATION OF HOLOGRAOHIC DEVICE
10) A) ADVANTAGES
B) LIMITATIONS
11) OBSTACLES IN DEVELOPMENT OF HOLOGRAPHIC STORAGE
12) OTHER APPLICATIONS
13) CONCLUSION
14) REFERENCES
INTRODUCTION
With its omnipresent computer all connected via internet information age has
lead an explosion of information available to users. With the decreasing cost of
storing data and increasing storage capacity with a same small device foot print
have been key enablers of this revolution. While the current storage need are
being met the storage technologies must continue in order to keep pace with a
rapidly increasing demand.
However both magnetic and conventional optical data storage technologies,
where individual bits are stored as distinct magnetic or optical changes in the
surface of recording medium, are approaching physical limits beyond which
individual bits are too small or too difficult to store. Storing information through
the volume of the medium not on its surface offers an intriguing high capacity
alternative. Holographic data storage is a volumetric approach, which has made
recent progress towards practicality with the appearance of lower cost enabling
technologies.
Hence the holographic memory has become a great white whale of
technology research.
CONCEPT OF HOLOGRAPHIC MEMORY
Holography is a technique which allows recording and playback of 3- dimensional
image. The is called a hologram unlike other 3-dimenssional “picture” hologram
provide
1) INTRODUCTION
2) A) CONCEPT OF HOLOGRAPHY
B) HISTORICAL ROOT
C) WHAT IS HOLOGRAM
3) HOLOGRAOHIC MEMORY
4) TECHNIQUE FOR STORING DATA ON A HOLOGRAPHIC MATERIAL
5) SPATIAL LIGHT MODULATOR
6) MULTIPLEXING
TECHNIQUE FOR RETREIVING DATA FROM A HOLOGRAOHIC
MATERIAL
8) ERROR CORRECTION
9) TECHNICAL SPECIFICATION OF HOLOGRAOHIC DEVICE
10) A) ADVANTAGES
B) LIMITATIONS
11) OBSTACLES IN DEVELOPMENT OF HOLOGRAPHIC STORAGE
12) OTHER APPLICATIONS
13) CONCLUSION
14) REFERENCES
INTRODUCTION
With its omnipresent computer all connected via internet information age has
lead an explosion of information available to users. With the decreasing cost of
storing data and increasing storage capacity with a same small device foot print
have been key enablers of this revolution. While the current storage need are
being met the storage technologies must continue in order to keep pace with a
rapidly increasing demand.
However both magnetic and conventional optical data storage technologies,
where individual bits are stored as distinct magnetic or optical changes in the
surface of recording medium, are approaching physical limits beyond which
individual bits are too small or too difficult to store. Storing information through
the volume of the medium not on its surface offers an intriguing high capacity
alternative. Holographic data storage is a volumetric approach, which has made
recent progress towards practicality with the appearance of lower cost enabling
technologies.
Hence the holographic memory has become a great white whale of
technology research.
CONCEPT OF HOLOGRAPHIC MEMORY
Holography is a technique which allows recording and playback of 3- dimensional
image. The is called a hologram unlike other 3-dimenssional “picture” hologram
provide
References: CHIP magazine, pp- 26-32, April 2001 www.almaden.com www.eik.bme.hu www.vision.caltech.edu Mansi, Mark “the hard disk survival guide”, BPB publications, 1993