3D Holographic

Projection Technology

ABIN BABY

ROLL NO: 03

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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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

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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Timeline of holography5

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Types of

HologramsA. 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

holograms

workThe 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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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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Recording a hologram 10

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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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Reconstructing a hologram 16

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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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Projection of multicolour holographic 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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Projected cost of Holographic

system

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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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• “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 25

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