Published on: Mar 4, 2016
Transcripts - Pooja,110583,it4
It is an advanced optical disc that’s presently in the
The Holography technique was invented in 1948 by the
Hungarian Dennis Gabor.
Developed by the “Holography Storage Development
Storage capacity : It can store up to 1-4 TB of
information in a sugar cube sized crystal.
Holographic versatile disc is a holographic
storage format that looks like a DVD but is
capable of storing far more data.
It can store up to 830 times the data of a regular DVD and 160 times
that of a Blu-ray disc.
An HVD is a successor to today’s Blu-ray and HD-DVD technologies.
Data transfer rate :- 1 Gigabit per second.
As computer systems continue to become faster and faster,
they will need a way to access larger amounts of data in
shorter periods of time.
This huge requirement of memory could not be available
using 1st,2nd or 3rd gen. optical discs.Hence ,to full-fill these
requirements HVD has become today’s need.
“For Internet applications alone, industry estimates are
that storage needs are doubling every 100 days”.
By the year 2010, a storage system serving an average LAN
will need … 100 TB and a WAN server will require 10TB to 1
petabyte …of storage.
It is a memory that can store information in form of
holographic 3D image.
In it , information can be stored at high density inside
Conventional memories use only the surface to store the
data. But holographic data storage systems use the volume to
store data. It has more advantages than conventional storage
Unlike magnetic storage mechanisms which store data on
their surfaces, holographic memories store information
throughout their whole volume.
In collinear holography there are two type
of laser beam.
1.Red laser(Reference beam)(635nm)
2.Green laser(Signal beam)(532nm)
This two beams are collimated in a single beam.
The green laser reads data encoded as laser
interference fringes from holographic layer near
the top of the disc.
• The recorded patterns of light rays after
interference are called a hologram.
Microscopic Photo of Stored Hologram
Holographic storage systems contain some
components basic to the setup.
These are :-
a) Laser Beam
b) Beam Splitters to split the Laser Beam
c) Mirrors to direct the Laser Beam
d) Spatial Light Modulator(SLM)
e) Lenses to focus the Laser Beam
f) Recording Material or Photopolymer
g) CCD cameras
In a holographic memory device, a laser beam is split in
two, and the two resulting beams interact in a crystal
medium to store a holographic recreation of a page
Translates electronic data (0's and
1's) into optical pattern of light and
Data is arranged in an array similar
to a checkerboard of usually 1M
By varying the angle of the
reference beam, wavelength many
holograms can be stored in the same
volume of storage material.
SPATIAL LIGHT MODULATOR
The process of writing information onto an HVD begins
with encoding the information into binary data to be
stored in the SLM. These data are turned into ones and
zeroes represented as opaque or translucent areas on a
"page" -- this page is the image that the signal beam is
going to pass through.
WORKING OF HVD
1. Once the page of data is created, the next step is to fire a laser
beam into a beam splitter to produce two identical beams. One
of the beams is directed away from the SLM -- this beam becomes
the reference beam. The other beam is directed toward the SLM
and becomes the signal beam.
2. When the signal beam passes through the SLM, portions of the
light are blocked by the opaque areas of the page, and portions
pass through the translucent areas. In this way, the signal beam
carries the image once it passes through the SLM.
3. When the reference beam and the signal beam rejoin on the same
axis, they create a pattern of light interference -- the holography
data. This joint beam carries the interference pattern to the
photopolymer disc and stores it there as a hologram.
In order to retrieve and reconstruct the holographic page of data
stored in the crystal, the reference beam is shined into the crystal
at exactly the same angle at which it entered to store that page of
Each page of data is stored in a different area of the crystal, based
on the angle at which the reference beam strikes it.
During reconstruction, the beam will be diffracted by the crystal
to allow the recreation of the original page that was stored.
To read the page ,one need to pass it through detector
and then through CCD camera, which will project the data
on to the display panel.
The key component of any holographic data storage system is
the angle at which the second reference beam is fired at the
crystal to retrieve a page of data. It must match the original
reference beam angle exactly. A difference of just a thousandth
of a millimeter will result in failure to retrieve that page of data.
1 GB/s $120 $3000
It has been estimated that the books in the U.S.
Library of Congress, the largest library in the world ,
could be stored on six HVDs.
The pictures of every landmass on Earth - like the
ones shown in Google Earth - can be stored on two
With MPEG4 ASP encoding, a HVD can hold
anywhere between 4,600-11,900 hours of video,
which is enough for non-stop playing for a year.
Large Capacity:1 HVD=6000
cd=830 DVD=160 BD
High Data Transfer Rate
Fault and Damage Tolerance
Reads and Writes quickly
Resistant to Damage
It is very difficult to arrange all of those components like CCD
camera , SLM and beam steering devices.
Needs good recordings sensitive material to allow high data
If too many pages are stored in one crystal, the strength of each
hologram gets diminished.
Manufacturing cost HVD is very high and there is a lack of
availability of resources which are needed to produce HVD.
You would be unable to locate the data if there’s an error of
even a thousandth of an inch.
Initial price of the player and disc are high.
Have tremendous implications in the commercial,
industrial and d-Cinema.
We will find wide use for backing up and archiving the
media libraries, including the one at the Hollywood
The fourth-generation optical disc that would replace
the Blu-ray Disc format will be of terabyte-class
Prof. Inoue’s research group successfully put a
Holographic Versatile Disc (HVD) based on the
collinear holography technique into practical use.
The HVD format is expected to be able to hold over
1.3 terabytes of information on a CD-size disc in the
Group of some 20 major electronics manufacturers
jointly move for standardization of this format.
HVD was adopted for international standard by
Europe-based Ecma international in 2007, raising
expectations for its domination of international markets.
The Research Center for Advanced Photonic
Information Memories was established on the campus of
Toyohashi University of Technology, and joint
development is underway through an academic-
industrial consortium that uses the center as a base.
The global market is expected to exceed that of the
Blu-ray Disc (Estimated to be about 300 billion yen in
Impact of Research Achievements
The future of holographic memory is very promising. The
holographic storage provide high data density. It can easily store
1000GB of data in a small cubic centimeter crystal reducing the
cost on the other hand. It may offer high data transfer rate.
But even then the holographic way of storing data is still at the
base stage and it may take another couple of years for this
technique to hit desktop with a real life data storage solution.
However this technology itself is dazzling and aims to light up
the desktop Experiences.