3. 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
3
4. What is Holography
Holography is a technique that allows the light scattered from an object to be
recorded and later reconstructed.
The technique tooptically store,retrieve,and process information.
Preserve the 3-D information of a holographed subject
4
5. 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
5
7. 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
7
8. 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
9. 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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10. Recording of
Hologram
Basic tools required to make a
hologram includes a lasers,
lenses, beam splitter, mirrors
and holographic film
Holograms are recorded in
darker environment
10
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)
12
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
photographicfilm.
Ex: Silver Halide Emulsion
13
14. Reconstruction
Of Hologram
The photographic plate is
illuminated with original light
source used for recording
holograms.
14
s
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.
16
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
17
19. Advances in
Technology Touchable holograms
Tactile holographic display
with haptic feedback
Horizontal 360º view of a
image on table top
User interfacing integrated
displays
19
20. 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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21. 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
21
23. 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
23
24. • “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 24
