1. Holographic
Memory
BY
PRASANNA KUMAR
10135A1202

2. Contents
2
 Introduction to Holographic Memory
 History of the Holographic Memory
 Components of Holographic Memory
 Basics of working
Writing to disk
Reading from disk
 Spatial Light Modulator
 Storing techniques
 Properties of Holographic Data Storage
 Applications of Holographic Memory
 Pros and Corns of the system
 Conclusion
 References
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3. Introduction to Holographic
Memory
 Holographic memory is a developing technology that has
promised to revolutionize the storage systems.
 Holographic memory is an advanced optical storage
device that can store information in the form of
holographic image.
 A method of producing a three-dimensional image of an
object by recording on a photographic plate or film the
pattern of interference formed by a split laser beam and
then illuminating the pattern either with a laser or with
ordinary light.
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4. History of Holographic Memory
 Scientist Pieter J. Van Heerden proposed the idea of
holographic(three-dimensional) storage in 1940
 It is invented in 1947 by the Hungarian-British physicist
Dennis Gabor (1900-1979), who won a Nobel Prize for
his invention in 1971.
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5. 5
HVD technology
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1. Green writing/reading laser
(532 nm)
2. Red positioning/addressing
laser (650 nm)
3. Hologram (data)
4. Polycarbon layer
5. Photo polymeric layer (data-
containing layer)
6. Distance layers
7. Dichroic layer (reflecting
green light)
8. Aluminum reflective layer
(reflecting red light)
9. Transparent base

6. 6
Cont..
• Holographic Versatile Disc(HVD) is an optical disk
technology still in research stage which would hold up to
3.9 TB of information
• The HVD also has a transfer rate of 1 gigabyte/s
• It is a technique that can store information inside crystals
or photopolymers.
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7. Components of Holographic
Memory
7
1. Blue-green Argon Laser
2. Beam splitters to spilt the laser beam
3. Mirrors to direct the laser beams
4. LCD panel (spatial light modulator)
5. Lenses to focus the laser beams
6. Lithium-niobate crystal or photopolymer
7. Charge coupled device camera
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8. 8
Writing to Disk
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9. 9
working principle
SLM
Objective Lens
Cover Layer
Recording Layer
Reflective Layer
Inner :Information
Outer :Reference
Fourier transformed
information beam
Diffracted reference
beam (modulated)
Diffracted information
beam (page data)
Fourier transformed
reference beam
Recorded Hologram
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10. 10
SLM
 A Spatial Light Modulator is used for creating
binary information out of laser light. The SLM is a
2D plane, consisting of pixels which can be turned on
and off to create binary 1’s and 0’s.
 An SLM can usually be refreshed at rates of about 1000
frames per second
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11. 11
Storing Techniques
Multiplexing
 Angular Multiplexing : By modifying the angle of a source
beam, large amount of data is stored in the volume.
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12. 12
Cont..
 Wavelength Multiplexing : Alters the wavelength of source
and reference beams between recordings
 Spatial Multiplexing : Changing the point of entry of source
and reference beams into the recording medium
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13. 13
Reading from Disk
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15. 15
Technology Comparison
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16. 16
Holographic Data Security
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17. 17
Data Transfer Rate
1985 1990 1995 2000 2005 2010 2015
Availability Year
1M
10M
100M
1G
10G
100G
DataTransferRate,bits/sec
Blu-ray
HD DVD
0.1M
DVD
Tape
HDD
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How HVD compares with other storage
device?
 While HVD is attempting to revolutionize data storage,
other discs are trying to improve upon current systems.
Two such discs are Blu-ray and HD-DVD, deemed the
next-generation of digital storage.
HD-DVD Blu-ray HVD
Initial cost for
recordable disc
Approx. $10 Approx. $18 Approx. $120
Initial storage
capacity
30 GB 54 GB 300 GB
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Applications of Holographic Memory
• Data Mining : Retrieval of data is very fast and storing
large amount of data in a single disk.
• Petaflop computation : performs thousand trillion
floating point operations per second.
• Holographic memory can be used as an extended
DRAM with 10ns access time.

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Advantages of Holographic Memory
1. Resistance to damage - If some parts of the medium
are damaged, all information can still be obtained from
other parts.
2. Efficient retrieval - All information can be retrieved
from any part of the medium.
3. High storage capacity of 3.9 terabyte(TB)
4. While reading data the entire page of data can be
retrieved quickly and at one time .
5. Backward compatible, supports CD’s and DVD’s also.
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Disadvantages of Holographic Memory
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• Manufacturing cost of HDSS is very high.
• There is a lack of availability of resources which are needed
to produce HDSS.
• Writes in the same fashion can degrade
previous writes in the same region of the medium.

22. 22
Cont..
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• The re-illuminated reference beam used to retrieve the
recorded information, also excites the donor electrons and
disturbs the equilibrium of the space charge field in a manner
that produces a gradual erasure of the recording.
• The crystal used as the photographic filament must have
exact optical characteristics.

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Holographic Memory Systems
 Fuji Photo Film
 Imation
 Toshiba
 Konica-Minolta
 Matsushita/Panasonic
 Memory-Tech
 Micron
 Mitsubishi Chemical
 Nippon Paint
 OPTWARE
 TV Asahi Corporation
 TV Tokyo Corporation
 Warner Bros.
 Disney
 Universal
 Pioneer
 Sanyo
 JVC
 NEC
 InPhase Technologies
 Maxell
 Aprilis
SOME OF THE CURRENT PLAYERS
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Key Technological Partners

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Conclusion
 HVD will soon replace present DVDs.
 It is currently supported by more than 170 of the world's
leading consumer electronics, personal computer,
recording media, video game and music companies.
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References
http://www.tech-faq.com/hvd
http://electronics.howstuffworks.com/hvd.html
http://en.wikipedia.org/wiki/holographic_versatile_disc
http://www.eweek.com/article2/0,1759,1759907.asp
http://en.wikipedia.org/wiki/holographic_data_storage
http://electronics.howstuffworks.com/hvd6.htm
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