応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
ISSN-L : 0369-8009
Rh添加LiNbO3におけるホログラム記録
三上 修石田 晶宮沢 信太郎
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1974 年 43 巻 12 号 p. 1219-1225

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Holographic storage properties, such as writing, reading out, erasing and persistence, were investigated in single crystals of Rh-doped LiNbO3. Thermal annealing in an oxygendeficient atmosphere and/or Cu-doping by thermal diffusion were found to improve optical sensitivity remarkably. The Cu-diffused layers fabricated in Rh-doped LiNbO3 are quite effective to high-speed optical writing and erasing, and, at the same time, do not reduce the persistence of holograms to any appreciable extent. Similar effects were found with an oxygendeficient Rh-doped LiNbO3. However, the persistence of the stored holograms exhibited a two-step decay behavior and its initial decay was remarkable. These facts indicate the co existence of two types of impurities; i.e., one which improves photo-sensitivity but reduces persistence, and the other which improves persitence only. In our case, the former impurity islikely to be Cu or oxygen-deficiency and the latter to be Rh

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