Holography is a technique that records and reconstructs light scattered from objects, preserving 3D information without the need for projection screens. The history of holography dates back to Dennis Gabor's foundational paper in 1948, and it has evolved to include various types of holograms and applications ranging from entertainment to military uses. The future of holography suggests a shift towards holographic displays replacing current technology in various fields.

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SAMEER DHURAT (83)
SNEHA PINGAT (88)

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What is Holography
• Holography is a technique that allows the light
scattered from an object to be recorded and later
reconstructed.
• Preserve the 3-D information of a holographed
subject
• The technique of holography can also be used to
optically store, retrieve, and process information

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 Dennis Gabor - Father of
Holography and Holographic
Technologies
 Dennis wrote a paper in 1948
that has become the
foundation of modern
Holography.
 The most interesting thing
about all this is that laser light
had not even been invented
yet, when he wrote his paper.
HISTORY

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• A high resolution three
dimensional recording of
an object
• Glasses free 3D display
• No need for projection
screen
• Life like images
• Interactive display
Why holographic display

5. Timeline of holography

6. A. Reflex hologram
– Illuminated by a spot of white
incandescent light source, from front-
above
– The image consists of light reflected by
the hologram
– Produces multicolour holograms,
makes images optically
indistinguishable from the original
objects
Types of Holograms

7. B.Transmission hologram
 Viewed with laser light, usually of the
same type used to make the recording
 Need light source behind them
 Virtual image can be very sharp and
deep
C.Computer-generated holograms
 No need for a real object
 Interference pattern is calculated
digitally, using algorithms

8. APPLICATIONS
 Entertainment
 Teaching and Training
 Virtual Communication
 Simulation and Planning
 Military and Space
Application

9. How holograms works
The time-varying light field of a
scene with all its physical
properties is to be recorded and
then regenerated.
 Hence the working of
holography is divided into two
phases:
•Recording
•Reconstruction

10. Working Of Holography

11. Recording of hologram
• Basic tools required to
make a hologram includes
a red lasers, lenses, beam
splitter, mirrors and
holographic film
• Holograms are recorded
in darker environment

12. • Laser : Red lasers, usually helium-neon (HeNe) lasers, are
common in holography. These are coherent light source.
• Beam splitter: This is a device that uses mirrors and prisms
to split laser beam of light into two beams.
 Object beam (directed onto the object) and
 Reference beam (travels directly onto the recording
medium)

13. • Mirrors: These direct the beams of light to the correct
locations
• Holographic film: Holographic film can record light at
a very high resolution, which is necessary for creating a
hologram. It's a layer of light-sensitive compounds on a
transparent surface, like photographic film.
• Eg: Silver Halide Emulsion

14. Recording a hologram

16. Process
• When the two laser beams reach the recording
medium, their light waves intersect
and interfere with each other. It is this interference
pattern that is imprinted on the recording medium.
Hologram
Recording
Hologram
Reconstruction

17. Reconstructing a hologram

18. Applications
& Future scope
• Educational applications
• Marketing with 3D holographic
display
• 3D simulation displays for
scientific visualization
• Improved virtual Reality and
augmented reality
• Telepresence and video
conferencing
• Entertainment displays
• Military and Space Applications

19. • Holographic checkpoint
for military, battlefield
simulations
• Intense real gaming rooms
• In future all displays like
televisions, mobile phone
displays, projector displays
will be replaced by
holographic displays

20. Conclusion • Holographic Technology
and Spectral Imagining has
endless applications, as far
as the human mind can
imagine
• In future, holographic
displays will be replacing
all present displays in all
sizes, from small phone
screen to large projectors

21. • “Holographic Projection Technology: The World is Changing.”; Ahmed
Elmorshidy, Ph.D
JOURNAL OF TELECOMMUNICATIONS, VOLUME 2, ISSUE 2, MAY 2010
• “Capture, processing, and display of real-world 3D objects using digital
holography”; Thomas J. Naughton; 2010 IEEE Invited Paper
• “Touchable Holography”; Takayuki Hoshi;
The University of Tokyo; 2009
• “Holographic 3-D Displays - Electro-holography within the Grasp of
Commercialization”; Stephan Reichelt, Ralf Haussler, Norbert Leister, Gerald
Futterer, Hagen Stolle and Armin Schwerdtner (2010)
• https://en.wikipedia.org/wiki/Holography
References

22. Thank
you