Do you know about Laser Holography ???

Actually in conventional photography a negative is made first and using it a positive print is produced later. The positive print is only a two-dimensional record of light intensity received from a three-dimensional object. It contains information about the square of the amplitude of the light wave is not recorded and is lost.

According to this technique both the phase and intensity attributes of the wave are recorded and when viewed the photograph shows a three-dimensional image of the object. This technique is named holography.

Holography is a two-state process. In the first stage a hologram is recorded in the form of interference pattern. In the second stage the hologram acts as a diffraction grating for the reconstruction beam and the image of the project is reconstructed from the hologram.

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