HOLOGRAPHIC DATAHOLOGRAPHIC DATA
(3D optical data storage)(3D optical data storage)
The Future in Data Storage
Hologram is a 3D image reproduced from a pattern
Several Terabyte level mass storage .
Uses a combination of laser and optical material to
3D optical data storage is related to holographic data
~The Beginning~~The Beginning~
Pieter J. van Heerden first proposed the idea of
holographic (three-dimensional) storage in the
A decade later, scientists at RCA Laboratories
demonstrated the technology by recording 500
holograms in an iron-doped lithium-niobate
~WHY DO WE NEED THIS?~~WHY DO WE NEED THIS?~
To increase data storage capacity by using the
space within the crystal that is been used in 1-D
and 2-D storage device.
Speed retrieval,transfer and search of data.
To avoid multiple read/write head complexity.
What isWhat is SLMSLM ??
SLM- Spatial light
SLM consists 1-D or 2-D
arrays of light modulating
SLM converts the digital data
1’s or 0’s into a 2-D array of
bright & dark spots.
SLM is used to imprint the
data on the object beam.
~About~About Lithium NiobateLithium Niobate Crystal~Crystal~
Chemical Formula- LiNbO3.
It has high photorefractive sensitivity & stability.
It has trigonal structure.
Molecular weight - 147.9.
Band gap - 4eV
What isWhat is CCDCCD ??
CCD - Charge
Its structure was proposed
in 1969 by Boyle & Smith.
CCD is a light sensitive
CCD converts pixels in
images into electric
CCD contains a separate
value for each colour.
~INTERESTING FACTS~~INTERESTING FACTS~
It has been estimated that all the books in the U.S. Library
of Congress, could be stored on six (6) HVD's.
The pictures of every landmass on Earth (Google Earth for
example) can be stored on two (2) HVD's.
With MPEG4 ASP encoding, a HVD can hold between 4,600
to 11,900 hours of video, which is enough for non-stop
playing for a year.
~PERFORMANCE & ADVANTAGES~~PERFORMANCE & ADVANTAGES~
The multi-layer system is optically transparent and
Unlike other technologies that record one databit
at a time, holography allows a million bits data to
be written and read in parallel with single flash of
It allows 1 million bits of data to be written or read
in a single flash of light through SLM.
Lasers were costly and unreliable.
If too many pages are stored in one crystal, the
strength of each hologram is diminished.
Align all of the HVD components in a low-cost
Holographic Data Storage is a convenient ,
effective and secure way of data storage.