This document discusses 3D holographic projection technology. It begins by defining holography as a technique that records and reconstructs light scattered from an object, preserving its 3D information. It then describes the basic components and process for creating and reconstructing holograms using lasers and holographic film. Advances allow for capturing and projecting holographic video using digital cameras and light modulators. The document concludes by outlining various applications of holographic displays in education, marketing, simulation, and entertainment, as well as future uses replacing all displays.

1. 3D Holographic
Projection Technology
NITESH KUMAR
SINGH
ROLL NO: 49

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
3
 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

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
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 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

7. B.Transmission hologram
7
 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
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
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9. 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

10. Recording a hologram 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. 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

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.
Hologram
Recording
Hologram
Reconstruction
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14. 14

15. Reconstruction
of hologram
15
 The photographic plate
is illuminated with
original light source used
for recording holograms.

16. Reconstructing a hologram 16
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17. 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.

18. 18
Projection of
holographic
video  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
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 Tactile holographic
display with haptic
feedback
Horizontal 360º view of a
image on table top
User interfacing
integrated displays

21. Applications
& Future scope
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 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

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. 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

25. References 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>
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26. Thank you
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