Holography is a technique that involves the use of laser, diffraction, interference, light intensity recording, and suitable illumination recording to produce three-dimensional images. Holograms are bewitching in the sense that the images change in accordance to the position and orientation of the viewing mode. The object or picture looks like as if moving and still present there offering a three dimensional view of the object. The recording in Holography is even not an image in itself but a random structure of varying intensity, profile and density.

Holography is basically a technique in which light field arising from light source dispersed off the object is recorded and to be reconstructed later when the object is not present. It is like recording music which can be reproduced later on when the musical instrument is not present. In technical terms, holography is also known as wave front construction. The technique was first discovered by the Hungarian physicist Dennis Gabor in 1947. But the technology was fully utilized only after the introduction of laser in 1960s.

Facts About Holography Techniques
Holography is an advanced technology which can be employed in several areas such as marketing, society, education, art and advertising. Some of the facts about Holographic Techniques are listed below:

• Holography represents the recording of an image according to the light coming from the original scene scattered in a range of directions rather than only in one direction. This allows the image to be viewed from different angles even in the absence of the object or source.



• Hologram can only be recorded with the use of a laser light while a photograph can be recorded using normal light sources. The light from the object is scattered directly to the recorded medium. It also requires a reference beam that can be directed to the recorded medium.



• Holograms can only be viewed in specific lighting conditions and forms of illumination. Even if the hologram is cut into two pieces, the whole scene can be seen in each single piece. The viewing range of Hologram adds more depth to the perception cues present in the original scene.

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