This document discusses 3D holographic projection technology. It begins by defining holography as a technique that records and reconstructs light scattered from an object, allowing the 3D information of a subject to be preserved. It then covers the basic components used to make holograms such as lasers and film, and explains the two-step process of recording and reconstructing holograms through the interference of light waves. Applications discussed include education, marketing, scientific visualization, and future uses in virtual and augmented reality. The document concludes by suggesting holographic displays will eventually replace all other display technologies.

1. 3D Holographic Projection
Technology
swathi.b

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 2

3. What is holography
 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.
 Preserve the 3-D information of a holographed subject
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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 multicolour
holograms, makes images
optically indistinguishable
from the original objects
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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:
•Recording
•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
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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
Recording
Hologram
Recondtruction

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15. Reconstruction of
hologram
 The photographic plate is
illuminated with original
light source used for
recording holograms.
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16. Reconstructing a hologram
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17. Capturing of
holographic
video
 By replacing the
conventional holographic
plate with a digital
camera and an
optoelectronic 2D screen,
we can capture and
display holographic video.
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18. Projection of
holographic
video
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 Video hologram is coded into
light modulators
 These light modulators are
illuminated by coherent light
beam source, to project
video

19. Projection of multicolour holographic
video
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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
 Entertainment displays
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22. 22
 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

23. Projected cost of Holographic
system
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24. 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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25. • “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>
References
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26. Thank you
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27. Questions?
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