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3D Holographic Projection Technology

ARSHYAN ALI ECE IV YEAR

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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

• A method of producing a three-dimensional image of an object by recording on a photographic plate or film the pattern of interference formed by a split laser beam and then illuminating the pattern either with a laser or with ordinary light.

• 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.

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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 holography

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Types of Holograms

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 multi colour 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 deepC.Computer-generated holograms

No need for a real object Interference pattern is calculated

digitally, using algorithms

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How holograms 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:o Recordingo 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

• 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

HologramReconstruction

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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

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Different types and techniques of holography used

by artists1.Laser viewable transmission holograms.

The laser viewable transmission hologram allows for a near perfect reconstruction of the optical field. This means that the recorded scene appears behind the film, and when replayed by a laser this scene can be very deep and sharp.

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2. Pulse laser holography.

A pulse laser produces an ultra short flash of light, thus freezing motion and allowing for holograms of live subjects.

3.Stenciling and Multiplex holography.

Multiplexing is a technique of recording multiple holographic exposures across the surface of the master hologram.

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4. Dot-matrix holograms.

Dot-matrix hologram printing is a technique of building up an image of diffractive ‘pixels’. Each area is recorded with a particular geometry that diffracts light by a corresponding angle.

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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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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.DJOURNAL 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

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QUERIES

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Thank you