The document discusses 3D holographic projection technology. It begins by defining holography as a technique that allows light scattered from an object to be recorded and later reconstructed, preserving the object's 3D information. It then covers the basics of how holograms work and are made, including recording the interference pattern of an object beam and reference beam, and reconstructing the hologram by illuminating the recorded pattern with the original light source. The document concludes by discussing advances and applications of holographic technology, such as touchable holograms and its potential to replace displays in the future.

1. 3D Holographic
Projection Technology
GUIDED BY,
SAFUVAN T
ASST.PROFESSOR
DEPT.OF ECE
YCET
SUBMITTED BY,
SHAHID S
ROLLNO: 12416055
YCET
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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
 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. 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
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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. 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 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.
Hologram
Recording
Hologram
Recondtruction
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14. Reconstructio
n of hologram
 The photographic plate is
illuminated with original
light source used for
recording holograms.
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15. Reconstructing a hologram
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16. 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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17. Projection of
holographic
video  Video hologram is
coded into light
modulators
 These light modulators
are illuminated by
coherent light beam
source, to project video
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18. 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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19. 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
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20.  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
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21. 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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22. • “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)
References 22

23. Thank
you
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