Holographic technology allows for three-dimensional data storage by using lasers and photosensitive materials to record holograms. Dennis Gabor invented holography in 1947 by using coherent light to record the phase of an object. A hologram is reconstructed by exposing the photosensitive recording material to the original reference beam without the original object. Holographic data storage can achieve extremely high densities and uses spatial light modulators and interference patterns within holographic materials to store and retrieve data in parallel as light is diffracted off volume gratings. Potential applications include high-capacity data storage, medical imaging, virtual reality, and more.

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HOLOGRAPHIC
TECHNOLOGY
PRAGATI PORWAL
B.TECH
COMPUTER SCIENCE
SECTION:-B
ROLL NO:-8184 (8)
ID:- BTBTC16251

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CONTENT:-
• Introduction
• Timelines of Holography
• What is Holography
• Working of Hologram
• Application
• Holographic Data Storage
• Benefits
• Drawbacks
• Conclusion
• Facts
• References

3. INTRODUCTION:-
• A holography originated from the Greek word “HOLO” means
COMPLETE and “GRAPHY” means WRITING .Thus it is a
technique to record the complete picture of an object.
• A holographic technique was invented in 1947 by Hungarian
Dennis Gabor.
• Records phase of the object.
• Can be see naked eyes.
• Record our three dimensional world on a two dimensional
recording medium.

4. TIMELINE OF HOLOGRAPHY

5. Holography is technique that enables a light field which is generally
a product of light source scattered of object to be recorded and later
reconstructed when a original light field is no longer present, due to
absence of original objects.
The overall process requires:-
 Coherent light beam
 Shutter
 Beam Splitter
 Mirror
 Photographic Plate
What is holography?

6. CONSTRUCTION OF HOLOGRAM

7. RECONSTRUCTION OF HOLOGRAM

8. APPLICATIONS
ENTERTAINMENT
GAMING
TEACHING AND
TRAINING
ADVERTISING

9. VIRTUAL COMMUNICATION SIMULATION AND PLANNING
MEDICAL DATA STORAGE

10. storage

11. HISTORY OF
STORAGE
MAGNETIC OPTICAL
185mb 1.44mb 783mb 4.7gb 30-50gb 1-4tb8tb
Tape Floppy Disc Hard Drive CD DVD Blue-ray HVD

12. Holographic
Data
Storage(HDS)

13. COMPONENTS:-
a) Laser Beam
b) Beam Splitter to split the Laser Beam
c) Mirrors to direct the Laser Beam
d) A Liquid crystal Display Panel(SLM)
e) Lenses to focus Laser Beam
f) Recording Material
g) CCD camera

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Spatial Light Modulator
(SLM):-
A spatial light modulator is
used to creating binary
information out of laser light.
The SLM is 2D plane,
consisting of pixel, which can
be turned on and off to
creating binary 1.s and 0.s

15. Working of HDS:-
 Writing:-
 The light is split in two by the beam
splitter.
 The signal or object beam will bounce
off a mirror and passes through SLM.
 The reference beam, on the other hand,
takes another course towards the
Lithium Niobate crystal and upon the
hitting it along with the object beam,
create an interference pattern that will
be store the information of object beam
in a certain location in the crystal.

16. Working of HDS:-
 Retrieving :-
 The interference pattern include
modulations in the refractive index of the
recording material yielding diffractive
volume gratings.
 The reference beam is used during readout
to diffractive off of the recorded gratings,
reconstructing the stored array of bits.
 The reconstructed array is projected onto a
CCD detector that reads the data in parallel

17. HOLOGRAPHIC DATA STORAGE(HDS):-
• Holographic data storage is three-dimensional data storage system
that can store information at high density inside the crystal or
photopolymer.
• Holographic Data Storage is a potential technique in the area of high
capacity data storage in the form of multiple images in the same area
utilizing light at different angles according bits in parallel.
• Holographic data storage contains information using an optical
interference pattern within a thick, photosensitive optical material.
• It can store information in the form of holographic image (Hologram).
• The stored data is read through the reproduction of same reference
beam used to create hologram.

18. BENEFITES OF HDS:-
HIGH STORAGE DENSITY
LESS DATA ACCESS TIME
HIGH DATA TRANSFER RATE

19. DRAWBACK OF HDS:-
LASER OUTPUT
POWER
TEMPORARY DECAY
OF HOLOGRAM
SENSITIVITY OF
HOLOGRAPHIC
MATERIAL

20. CONCLUSION
This will be the opening of a new era in data
storage and data processing .
Applications requiring and using unusually high
storage capacities will revolutionize mobile
computing and global information security.

21.  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(Holographic versatile disc).
The pictures of every landmass on Earth -
like the ones shown In Google Earth – can
be stored on two HVDs.
If you tear a hologram in half, you can still
see the whole image in each piece . The
same is true with smaller and smaller
pieces
FACTS

22. REFERENCES
o https://science.howstuffworks.com/hologr
am.htm
o https://en.wikipedia.org/wiki/Holography
o http://www.answers.com
o https://en.wikipedia.org/wiki/Holographic
_Versatile_Disc

23. Thank you