Question

With a labelled diagram, discuss the recording a hologram

27 Jan 2018
Answer :
Word Count : 909

When a photograph is taken by using the ordinary camera, only the amplitude arising from the different points of the object is recorded in the photographic plate. At that time, phase characteristic is completely lost. But the technique of taking the photograph in which both the amplitude and the phase are recorded in the photographic plate is called holography. Due to this technique, 3 dimensional image of three dimensional object is possible.

The word holography is derived from the two Greek words hole-whole and graphy - record. Thus, the holography is the technique of recording all the information of the object in the image.

Image ignouacademy-com--p-hologram-33802

Holography is the revolutionary technique of taking three dimensional image of an object and its principle was first work out by the scientist Gabor in the year 1948. But at that time, due to the absence of perfect monochromatic source of light, real potential of the holography was unclear, it becomes clear after the invention of LASER.

Basic Technique Of Holography:

The object whose hologram is to be made is illuminated by the light of perfect monochromatic source. At that time different points of the object acts as the source of secondary wave front which spread out around the surrounding space with the amplitude characteristic of the object can be taken as the coherent source and the light from different point undergo superimposition. As a result of this, interference pattern produced. These patterns are recorded by the suitable manner. The recorded patterns is again illuminated by the monochromatic light such as the LASER which again produces the original characteristic of the amplitude of

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