3D Holographic

Projection Technology

BY

M.MUKESH

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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Timeline of

holography

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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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Recording a

hologram

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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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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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