1. 3D Holographic Technology
DMS 110
Weiye Zhai

2. 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.

3. Why Holographic Display
A high resolution 3D recording of an object.
Glasses free 3D display.
No need for projection screen
Interactive display

4. Timeline of Holography Development

5. Types of Holograms A. Reflex Hologram
Illuminated by a spot of white incandescent light source, form front-above.
The image consists of light reflected by the hologram.
Produces multicolor holograms, makes images optically indistinguishable from the original objects.

6. 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.

7. Types of Holograms C. Computer-generated Holograms
No need for a real object
Interference pattern is calculated digitally, using algorithms.
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 2 phases:
Recording
Reconstruction

8. Recording of Hologram Basic tool required to make a hologram:
Red lasers
Helium-neon lasers, a coherent light source.
Lenses
Beam splitter
A device that uses mirrors and prisms to split laser heam of light into 2 beams
Object beam – directed onto object
Reference beam – travels directly onto the recording medium
Mirror
Direct the beams of light to correct locations
Holographic film

9. Process
When the 2 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.

10. Reconstruction of Hologram
The photographic plate is illuminated with original light source used for recording holograms.

11. Projection of Holographic Video
Video hologram is coded into light modulators
These light modulators are illuminated by coherent light beam source, to project video

12. Examples

13. Future Scope Educational applications
Marketing with 3D holographic display
3D simulation displays for scientific visualization
TVs, mobile phone displays …

14. Thanks For Watching