Abstract
Many workers are turning away from holograms made with thin photographic emulsions and are investigating ‘thick’ holograms, with their exciting potential of high diffraction efficiency, increased information storage capacity, reduced noise, and increased spectral or angular discrimination. This article discusses the principles of thick hologram theory, and describes some of the materials which can be used as thick recording media. Advantages and limitations of thick holograms are illustrated by experimental examples. The article concludes with a survey of the existing and future applications for thick holograms.
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