The various applications of holograms in different fields.

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2.  Birth of hologram
Preparation of hologram
Reconstruction of hologram
Uses of hologram
Future scope of holography
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3. o In 1947, English physicist Dennis
Gabor tried to improve the image-producing
capability of electron microscopes, which
use streams of electrons rather than light to
magnify objects.
o His solution was to take an electron
"picture" of an object. However, this process
required a coherent light source—
something that did not exist at the time.
o It wasn't until the early 1960s, when the
first working laser was produced, that 3-D
images could be created.
o For developing the basic principles of
holography, Gabor was awarded
the Nobel Prize in 1971.
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4. Two steps of image formation
a) Hologram:
The object is transformed into a photographic record.
b) Reconstruction:
The hologram is transformed into the image.
No lens is needed in either step!!
A method of obtaining three-dimensional photographic images.
These images are obtained without a lens, so the method is also
called
lens less photography.The records are called holograms. 4

5. Hologram and Holography
Holography is a method of producing a three-dimensional
(3-D) image of an object. (The three dimensions are height,
width, and depth.)
The image it brings to life is referred to as a hologram, from
the Greek word meaning "whole picture." Unlike a two-
dimensional picture, a hologram allows a person to look
"around" and "behind" its subject.
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6. o The hologram is actually a recording of the difference
between two beams of coherent light.
o Light is composed of waves that are all the same length
and that travel in all directions. Coherent light is in phase,
meaning its waves are vibrating and traveling together in
the same direction.
o To create a hologram, a laser beam (coherent light) is split
in two: one beam that stays undisturbed, called the
reference beam, strikes a photographic plate.
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8. o The second beam, called the object beam, strikes the
subject and then bounces onto the plate.
o The subject's interfering with the second beam causes the
two beams to become out of phase.
o This difference called phase interference is what is recorded
on the photographic plate.
o When a hologram is later illuminated with coherent light of
the same frequency that created it, a three-dimensional
image of the subject appears.
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9. Uses for holograms
o One of the most visible
applications of holography is in
the field of advertising.
Holograms can be found on the
covers of magazines, books, and
music recordings.
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10. o In the 1970s, automakers would often use cylindrical
holograms to show a new car model. A prospective car
buyer could walk around the tube and view the vehicle
from all angles, though the cylinder was actually
empty.
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11. o The medical field was also quick to find a use for
holograms. A holographic picture could be taken for
research, enabling many doctors to examine a
subject in three dimensions.
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12. o Also, holograms can "jump" mediums, that is, a hologram
made using X rays can be viewed later in white light with
increased magnification and depth.
o A critical application of holography is in computer data
storage. Magnetic disks, the most common storage device
for home and small-frame computers, is two dimensional,
so its storage capacity is limited.
o Because of its three-dimensional nature, a hologram can
store much more information. Optical memories store large
amounts of binary data (with series of zeroes and ones
representing bits of information) on groupings of small
holograms.When viewed by the computer using coherent
light, these groupings reveal a 3-D image full of information.
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13. o To study the rare species ,and extinct species .
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15. 3D Hologram and the Future
ofTechnology and Entertainment
If you ask me what I consider the best part of 3D, then my reply
would be 3D holography.What I like most about this new and
exotic technology hailing from 3D is it gathers together a number
of futuristic and technologically superior trends into a compact
form that could be mind-numbing at times.
3D holography hasn’t yet grown up, in fact it is still far from
growing up. But my hunch is within ten or fifteen years from now,
we are going to see some real improvements. What compels me
have this hunch are the recent developments that are awe-
inspiring. Different commercial segments importing 3D solutions,
3D making inroads into digital art and scientific concepts are
being applied by the technologists.
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16. o There are some really trendy technologies that belong to the 3D
holographic .There’s another technology, which is called touchable
hologram. It runs a software that relies on ultrasonic waves, and the user
who is touching the projected hologram, feels a pressure on his hand.
o Holographic TV is perhaps going to be the biggest of surprises.
Researchers at MIT are anticipating holographicTV could enter our
drawing room in just ten years down the line. If it turned into a valid
anticipation, then today’s 2DTV sets would be obsolete from the market.
o The laser plasma technology could give 3D an altogether new
shape. Aerial Burton has used plasma laser to have 3D images floated in
the air.The technology is in its nascent stage currently but it has plenty of
rooms to prosper in the future.Technologies such as plasma laser work in
a fascinating way, it accounts for opaqueness. Using this technology, light
could be viewed without it having to bounce off a surface.
o
3D holographic technologies
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