Holographic data storage uses interference patterns of laser light to store massive amounts of data in small volumes. It works by splitting a laser beam into a reference beam and data beam, and their interference patterns are recorded on a photosensitive storage medium. To read the data, the reference beam illuminates the interference pattern, projecting the data beam which is detected by a sensor. Key benefits are high storage capacity of terabytes in small spaces, rapid data retrieval, and increased security. Challenges include sensitivity of the storage medium and cost compared to existing technologies.

2. Overview...
 Introduction
 What is HDS?
 How does it work?
 System
 Recording and Reading the Data
 Storage Medium
 Uses of the System
 Cons and Pros
 Conclusion

3. Introduction
 Generally a Hologram is a 3D image
reproduced from a pattern of
interference.
 The Holography technique was invented
in 1948 by the Hungarian Dennis Gabor.
 Evolving in the last few years.
 Promise to be the data storing system of
the future.

4. Introduction
 Holographic Data Storage is an
advanced data storage concept that
stores information in the form of
holographic images.
 Holographic Data Storage is a
volumetric approach of storing data.
 An HDSS can store 1-4 TB of data on a
sugar-cube sized crystal.

5. Hologram
 The word Hologram is derived from a
Greek word ‘HOLOS’ meaning whole
and ‘gram’ meaning message.
 It tells information about size , shape,
brightness and contrast of object being
recorded.
 It is a 3D image formed by the
interference of light beam from a laser or
other coherent light source.

6. Hologram
 Typically, a hologram is a photographic
recording of a light field, rather than of an
image formed by a lens.
 It is used to display a fully three-
dimensional image of the holograph
subject, which is seen without the aid
of special glasses or other intermediate
optics.
 Holography is the science and practice of
making holograms.

7. What is Holographic Data Storage?
 Holographic data storage is a potential
technology in the area of high-
capacity data storage currently dominated
by magnetic data storage and
conventional optical data storage
 Storage System in which two beams from
the same laser source are used to record
the data into a ‘recording medium’.

8. Technology uses holograms which are created when a light from a
single laser beam is split into two beams

9. HOW DOES IT WORKS?

10. Uses a reference beam and data
beam to create an interference pattern
 While Writing:
 The intersection
of the two
beams causes a
change , which
is then stored
 While Reading
 Action of the
reference beam
and interference
pattern is used to
recreate the data
beam

11. The System
 Basic components of System:
Laser
Recording Medium
Mirrors
Spatial light modulator
Beam splitter
Shutters
Iris
Lenses
Half-wave plate

12. Recording The Data
 Holographic data storage contains
information using an optical interference
pattern within a thick, photosensitive optical
material
 Light from a single laser beam is divided
into two, or more, separate optical patterns
of dark and light pixels.
 By adjusting the reference beam angle,
wavelength, or media position, a multitude
of holograms (theoretically, several
thousand) can be stored on a single
volume.

13. Reading The Data
 The stored data is read through the
reproduction of the same reference beam
used to create the hologram.
 The reference beam's light is focused on the
photosensitive material, illuminating the
appropriate interference pattern, the
light diffracts on the interference pattern, and
projects the pattern onto a detector.
 The detector is capable of reading the data in
parallel, over one million bits at once, resulting
in the fast data transfer rate.
 Files on the holographic drive can be
accessed in less than 0.2 seconds.

14. Uses of the System
 Can be used to store any kind of
information from documents to videos.
 Other fields that uses this system are:
Government sectors
Libraries
Business
and more

15. Storage Medium
 There are mainly two storage mediums used:
Lithium-Niobate Crystal
Photopolymer
Media Parameters:
1.Diffraction efficiency
2.Holographic fidelity
3.Sensitivity
4.Dynamic Range
5.volatility

16. Holographic versatile disc
 HVD is an optical disc technology still in
the research stage which would hold up
to 3.9TB of information.
 It employs a technique known as
Collinear Holography where by two
lasers one red and one blue green are
collimated in a single beam.

17.  which is approx. 6000 times capacity of
CD-ROM,830 times capacity of DVD-
ROM and 160 times capacity of BLU-
Ray disc and 8 times capacity of
computer hard drives.
 Transfer Rate:1 GB/sec.

18. Comparison of HVD with other Storage devices

19. Pros:
**Storage Capacity
High density
small volume
**Effective
Rapid data rate
fast access
**Swift Searching
**Security
**Parallel access
**Longer Storage Life

20. Cons
 Sensitive
 Material limitations
 Noise
 Cost
 Problems with parallel recording

21. Conclusion
 Holographic Data Storage is convenient
and effective way of data storage.
 The HVD playing device would have
data rates 25 times faster than today’s
fastest DVD players.

22. -GANESH
NETHI