Hologram

Hologram
3D Holographic Projection Technology
What is Holography
Why Holography
Types of Holograms
How Holograms work
Recording of hologram
Reconstruction of hologram
Advances in technology
Applications & Future scope
Conclusion

1. 3D Holographic Projection Technology RANJAN N LOKEGAONKAR AMIT R JAWALE NIKHIL B KARAMBALKAR AKASH SALVE DARSHAN ONEKAR VIT ET-3

2. 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 2

3. 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 . P reserve the 3-D information of a holographed subject 3

4. 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 4

5. Timeline of holography 5

6. Types of Holograms 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 6

7. Transmission hologram Viewed with laser light, usually of the same type used to make the recording N eed light source behind them Virtual image can be very sharp and deep Computer-generated holograms No need for a real object Interference pattern is calculated digitally, using algorithms 7

8. 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: Recording Reconstruction 8

9. 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 9 RANJAN N LOKEGAONKAR

10. Recording a hologram 10

11. 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) 11

12. 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 12

13. 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 13

14. Reconstruction of hologram The photographic plate is illuminated with original light source used for recording holograms . 14

15. Reconstructing a hologram 15

16. 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. 16

17. Projection of holographic video Video hologram is coded into light modulators These light modulators are illuminated by coherent light beam source, to project video 17

18. Projection of multicolour holographic video 18

19. Advances in technology Touchable holograms Tactile holographic display with haptic feedback Horizontal 360º view of a image on table top User interfacing integrated displays 19

20. SONY 360 DISPLAY The 360 degree display prototype features a 24 bit color image which measures 96 x 128 pixels, and it will be able to be viewed in 360 degrees without the need for 3D glasses. 20

21. Touchable Holography : The display to track hand motion, and an airborne ultrasound tactile Display created in the university's lab to create the sensation of touch 21 RANJAN N LOKEGAONKAR

22. 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 22

23. Holographic checkpoint for m ilitary, battlefield simulations Intense real gaming rooms In future all displays like televisions, mobile phone displays, projector displays will be replaced by holographic displays 23

24. Projected cost of Holographic system 24

25. Conclusion Holographic Technology and Spectral Imagining has endless applications, as far as the human mind can imagine In future, h olographic displays will be replacing all present displays in all sizes, from small phone screen to large projectors 25

26. Thank you 26