Holography is the science of making holograms, which are physical recordings of light fields that can reproduce three-dimensional images. Hungarian physicist Dennis Gabor invented the basic technique of holography in 1947 and was awarded the Nobel Prize for it in 1971. A hologram uses interference and diffraction of laser light to encode a full 3D light field rather than a 2D image, allowing it to retain depth and parallax properties. The two main types are transmission and reflection holograms. Holography has advantages like high resolution 3D images and use for security but also disadvantages such as needing specialized equipment and light sources to view images.

1. HOLOGRAPHY
By Pavan Wagh
Guided by Gayatri Mam(Principal)
presentation
SHREE DNYANSAI VIDYALAYA & JR. COLLEGE

2. Introduction
 What is holography
 History of holography
 What is hologram
 Types of hologram

3.  Holographic properties
 Structure of holography
 How do holographic projection work
 Advantages & disadvantages of holography

4.  What is holography
• Holography is the science and practice of making holograms.
• Holography is distinct from lenticular and other earlier
autostereoscopic 3D display technologies, which can produce
superficially similar results but are based on conventional lens imaging.

5.  History of holography
• Dennis Gaber CBS FRS was Hungarian – British electrical engineer and
physicist, most notable for inventing holography, for which he later
received the 1971 Nobel prize in physics .

6. • They discovered basic technology of holography in 1947
• Optical holography did not really advance until the development of the laser in
1960.

7.  What is hologram
• Images requiring the aid of special glasses or other intermediate optics, stage illusions such
as Pepper’s Ghost and other unusual, baffling, or seemingly magical images are often
incorrectly called holograms.

8. • A hologram is a physical recording of an interference pattern which uses diffraction to reproduce
a three-dimensional light field, resulting in an image which retains the depth, parallax, and other
properties of the original scene.
• A hologram is a photographic recording of a light field, rather than an image formed by a lens.

9.  Types of hologram
• Transmission hologram
• Can be use to store data
• Uses coherent light Reflection hologram

10. • The kind you find on credit card
• Uses white light

11.  Holographic properties
A hologram is a physical recording of an interference pattern which uses diffraction to reproduce a three
dimensional light field, resulting in an image which retains the depth, parallax, and other properties of
the original scene.

12. The holographic principle is the same on a larger scale. All of the information should be
encoded in the event horizon of our universe in Planck length bits of spacetimes and
everything within is a projection of the two dimensional inner shell.

13. Structure of holography

14. How do holographic projection work
• Holographic projectors use holograms rather than graphic images to produce projected pictures.
They shine special white light or laser light on to or through holograms. The projected light produces
bright two or three dimensional images. Whiles plains daylight lets you see some simple hologram,
true 3d images require laser based holographic projectors.

15. You can view such images from different angles and see them in true perspective
miniature version of such projectors are in development. Using such a projector, a
smartphone could create an image for the viewer in an empty space rather than on
a small screen.

16.  Advantages & disadvantages of holography
Advantage
• Holography is a high resolution three dimensional recording of an object from
limited perspective
• Hologram is widely use for security purpose
• It is not possible to duplicate hologram
Hologram are quick and easy optical validation

17. Disadvantage
• Hard to see without good direct point source of light
• Not that bright

18. • It is expensive
• Require complicated precise machinery to
produce and view image

19. Reference by :- whatis.techtarget.com
www.livescience.com

20. Thank