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Holography

Holography proves more better in terms of recording visual material when it was discovered.

It is a technique by which the image of a 3-dimensional image when recosntructed or playback will render a 3-dimensional image as well.

2 beams of light that originates from a laser will be required to create the commn hologram. The laser light has a simple frequecy (monochromatic) as well as being coherent. A partial reflective mirror will next split up the light beams. Reorientation of the narrow beams will next take place and allowed to pass through an arrangement of a pin hole. The object beam will supply light to the surface of the object. The film next receives the scattered light. The reference beam, strikes the film directly. When the 2 beams interact on the film, an interference pattern known as a diffraction grating is produced. As such, the hologram is the film of this pattern.

The film will be developed and next viewed by the person using the same laser light which will illuminate the film. Thus, the image of the object will appear as a 3-dimensional object in space. Holograms are also produced with the objects knitted closely to the film. This will enable the user to view the hologram under ordinary light.

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Uses of Holography

  • Holographic microscopy - The whole area of an object si recoreded for further analysis
  • Development of optical gadgets - Scanners, filters,diffraction gratings.
  • Displays, e.g. advertising uses holography to give the in-depth feeling to ab object publicised or in any other way
  • It is also used in processes to monitor small changes in physical parameters.
  • Digitization of records for storage - Prevention of any cards to be forged. Security measures.