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SAMEER DHURAT (83)

SNEHA PINGAT (88)

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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.

• Preserve the 3-D information of a holographed

subject

• The technique of holography can also be used to

optically store, retrieve, and process information

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Dennis Gabor - Father of Holography and Holographic Technologies

Dennis wrote a paper in 1948 that has become the foundation of modern Holography.

The most interesting thingabout all this is that laser lighthad not even been inventedyet, when he wrote his paper.

HISTORY

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• A high resolution three dimensional recording of an object

• Glasses free 3D display

• No need for projection screen

• Life like images

• Interactive display

Why holographic display

Timeline of holography

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

Types of Holograms

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

APPLICATIONS

Entertainment

Teaching and Training

Virtual Communication

Simulation and Planning

Military and Space

Application

How holograms works

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

Working Of Holography

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

• 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)

• 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

Recording a hologram

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.

HologramRecording

HologramReconstruction

Reconstructing a hologram

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

• 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

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

• “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)

• https://en.wikipedia.org/wiki/Holography

References

Thank

you