In forming a hologram, two beams from the same laser are made to interfere. One beam is the light reflected from the scene to be photographically recorded; almost invariably, it is an extremely complicated one. The other is usually rather simple, often being a set of plane waves. This second set is called the reference wave, and, in reproducing or reconstructing for the viewer the originally recorded scene, a similar set is used to illuminate the developed photographic plate, the hologram.
KeywordsLaser Light Interference Pattern Reference Wave Zone Plate Virtual Image
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