HOLOGRAM TECHNOLOGY

Holography is the science and practice of making holograms. Typically, a hologram is a photographic recording of a light filed, rather than of an image formed by a lens, and it is used to display a fully 3-D  image of the holography subject, which is seen without the aid of special glass or other intermediate optics.

 The hologram itself is not an image and it is usually unintelligible when viewed under diffuse reflection light. It is an encoding of the light field as an interface pattern of seemingly random variations in the opacity, density, or surface profile of the photographic medium. When suitably lit, the interference pattern diffraction the light into a reproduction of the original light field and the objects that were in it appear to still be there, exhibiting visual depth cues such as parallax and virtual that change realistically with any change in the relative position of the observer.

In its pure form, holography requires the use of laser light for illuminating the subject and for viewing the finished hologram. In a side-by-side comparison under optimal conditions, a holographic image is visually indistinguishable from the actual subject, if the hologram and the subject are lit just as they were at the time of recording. A microscopic level of detail throughout the recorded volume of space can be reproduced. In common practices, however, major image quality compromises are made to eliminate the need for laser illumination when viewing the hologram, and sometimes, to the extent possible, also when making it.

LASER : In laser holography, the hologram is recorded using a source of laser light, which is very pure in its color and orderly in its composition.

PHYSICS OF HOLOGRAPHY : For a better understanding of the process, it is necessary to understand optics and diffraction. Interference occurs when one or more wave front are superimposed. Diffraction occurs whenever a wave front encounters an object. The process of producing a holographic reconstruction is explained below purely in terms of interference and diffraction.

HOW IT WORK :Holography is a technique that enables a light field, which is generally the product of a light source scattered off objects, to be recorded and later reconstructed when the original light field is no longer present, due to the absence of the original objects. Holography can be thought of as somewhat similar to sound recording, whereby a sound field created by vibrating matter like musical instruments  is encoded in such a way that it can be reproduced later, without the presence of the original 

vibrating matter

GENRAL LIFE IN HOLOGRAM PICTURE :