Download - holographic tecology
Content
s • 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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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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Why
holograp
hic 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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Types of
Hologra
ms
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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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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How
hologram
s 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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Recordin
g 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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• 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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• 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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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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Reconstruction
of hologram
The photographic
plate is illuminated
with original light
source used for
recording
holograms.
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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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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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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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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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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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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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