3 D Holographic Technology DMS 110 Weiye Zhai

3 D Holographic Technology DMS 110 Weiye Zhai

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.

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

Timeline of Holography Development

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.

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.

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

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 https: //www. youtube. com/watch? v=SKId. Y-c. OAz 0&t=63 s

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.

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

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

Examples � https: //www. youtube. com/watch? v=Xy. Tm. XLWCazw &index=4&list=RD 9 S 39 YCKVxg. I � https: //www. youtube. com/watch? v=5 Ru 9 Sk. GABQ 4 � https: //www. youtube. com/watch? v=j. DRTgh. GZ 7 XU

Future Scope � Educational applications � Marketing with 3 D holographic display � 3 D simulation displays for scientific visualization � TVs, mobile phone displays �… � https: //www. youtube. com/watch? v=ww. Uc. ZMfmj-Q � https: //www. youtube. com/watch? v=89 Kxxpm. Mhi 4

Thanks For Watching