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Holographic 3D displays were first proposed by Leith et al. in 1964, but practical applications were delayed because of the difficulty of both recording and reconstructing holograms. This difficulty was solved by white-light reconstruction holograms and by the use of pulse lasers for holographic recording. White-light reconstruction holograms were an outgrowth of the rainbow holograms developed by Benton and the thick reflection holograms developed by Denisyuk. Both of these techniques made large contributions to the development of the holographic 3D display. It was also very difficult to eliminate vibrations during the exposure of holograms, and pulse lasers such as ruby or YAG lasers were employed to record holograms of moving objects like animals and to record holographic portraits of human bodies. However, large-scale objects such as landscapes and architectures are still difficult to record in a hologram.
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