Slides on holography projection technology, helpful in seminars and for required information on holography projection technology.

1. 3D Holographic Projection
Technology
ARSHYAN ALI
ECE IV YEAR

2. Contents
• What is Holography
• Why Holography
• Types of Holograms
• How Holograms work
• Recording of hologram
• Reconstruction of hologram
• Advances in technology
• Applications & Future scope
• Conclusion
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3. What is holography
• A method of producing a three-dimensional image of an object
by recording on a photographic plate or film the pattern of
interference formed by a split laser beam and then illuminating
the pattern either with a laser or with ordinary light.
• Holography is a technique that allows the light scattered from
an object to be recorded and later reconstructed.
• The technique to optically store, retrieve, and process
information.
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4. Why
holographic
display
• A high resolution three
dimensional recording of an
object
• Glasses free 3D display
• No need for projection screen
• Life like images
• Interactive display
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5. Timeline of holography
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6. Types of
Holograms
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 multi colour
holograms, makes images
optically indistinguishable
from the original objects 6

7. 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. How
holograms
work
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• 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:
o Recording
o Reconstruction

9. 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
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10. Recording a hologram
College of Engineering Munnar 10

11. • 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)
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12. • 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
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13. 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.
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Hologram
Reconstruction
Hologram
Recording

14. Reconstruction
of hologram
• The photographic plate is
illuminated with original
light source used for
recording holograms.
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15. Reconstructing a hologram
College of Engineering Munnar 15

16. Different types
and techniques of
holography used
by artists
1.Laser viewable transmission
holograms.
The laser viewable transmission
hologram allows for a near perfect
reconstruction of the optical field.
This means that the recorded
scene appears behind the film,
and when replayed by a laser this
scene can be very deep and
sharp.
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17. 2. Pulse laser holography.
A pulse laser produces an
ultra short flash of light, thus
freezing motion and allowing
for holograms of live subjects.
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18. 3.Stenciling and Multiplex
holography.
Multiplexing is a technique of
recording multiple holographic
exposures across the surface of
the master hologram.

19. 4. Dot-matrix holograms.
Dot-matrix hologram printing is a
technique of building up an image of
diffractive ‘pixels’. Each area is
recorded with a particular geometry
that diffracts light by a corresponding
angle.
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20. Advances in
technology Touchable holograms
Tactile holographic display
with haptic feedback
Horizontal 360º view of a
image on table top
User interfacing integrated
displays
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21. 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
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• Entertainment displays
• Military and Space Applications

22. 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
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23. References
• “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)
• “How Holograms Work.”; Wilson, Tracy V. 2010.“ HowStuffWorks, Inc.
Downloaded November 05, 2010.
<http://science.howstuffworks.com/hologram.html>
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24. 24
QUERIES

25. Thank you
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