1. 1/30/2015 1
RENJITH PS
Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft

2. 21/30/2015
 Holographic memory is a technology
that can store information at high
density inside crystals or
photopolymers.
 The advantage of this type of data
storage is that the volume of the
recording media is used instead of
just the surface .

3. 31/30/2015
Technical aspects
 Like other media, holographic media
is divided into write once and
rewritable media .
 Rewritable holographic storage can
be achieved via the photorefractive
effect in crystals

4. 41/30/2015
 Mutually coherent
light from two
sources creates an
interference pattern
in the media. These
two sources are
called the reference
beam and the signal
beam

5. 51/30/2015
To record on the hologram, the data in
the form of electric signal is converted
to optical signals by a page composer
 The controller generates the address to
access the desired page
 This results in the exposure of a small
area of the recording medium through an
aperture

6. 61/30/2015
 The optical output signal is directed to
the exposed area by the deflector
 Using this beam deflecting mechanism,
the light (which carries the information)
and the reference beam are made to
interact

7. 71/30/2015
 The interference pattern is thus recorded
on the hologram. To record a different
page, the aperture is moved and the
above process is repeated.

8. 81/30/2015
 To retrieve the information stored in a
hologram, shine the reference beam
directly onto the hologram. When it
reflects off the hologram, it holds the
light pattern of the image stored there.
Then send this reconstruction beam to
a CMOS sensor to recreate the original
image.

9. 91/30/2015

10. 101/30/2015
ADVANTAGES
 HVD offers several advantages over
traditional storage technology. HVDs can
ultimately store more than 2 terabyte
(TB) of information -- that's 400 times
more than a single-sided DVD and 40
times more than a current double-sided
Blu-ray than a single-sided DVD and 20
times more than a current double-sided
Blu-ray DVD

11. 111/30/2015
 HVDs also use a thicker recording layer
than DVDs -- an HVD stores information
in almost the entire volume of the disc,
instead of just a single, thin layer.
 HVDs storing holograms in overlapping
patterns, while a DVD basically stores
bits of information side-by-side

12. 121/30/2015
 The other major boost over conventional
memory systems is HVD's transfer rate
of up to 1 gigabyte (GB) per second --
that's 40 times faster than DVD. An HVD
stores and retrieves an entire page of
data, approximately 60,000 bits of
information, in one pulse of light, while a
DVD stores and retrieves one bit of data
in one pulse of light.

13. 131/30/2015

14. 141/30/2015

15. 151/30/2015
Development and marketing
 At the National Association of
Broadcasters 2005 (NAB) convention in
Las Vegas, conducted the first public
demonstrations of the world’s first
prototype of a commercial storage
device at the Maxell Corporation of
America booth.

16. 161/30/2015
 The three main companies involved in
developing holographic memory,
Polaroid spinoff Aprilis, and Optware of
Japan ,IBM

17. 171/30/2015
Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft