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从记录密度可靠性方面考虑,全息照相存储作为下一代的大容量外存储器而受到重视,现在世界各地正在努力从事有关感光材料的研制及其系统化的研究。这里作为最近的动向,介绍一下读写存储用的新材料。原有的大部分感光材料,如同照相干板一样是利用了光的吸收,把它用于全息照相的场合,存在着不能重写、衍射效率低、需要诸如显影定影等处理的缺点。1968年美国贝耳研究所把激光束照射到铌酸锂之类的铁电体晶体上时发生局部的折射率变化(光损伤),当光再次照射到晶体上或把晶体加温到170℃以上时就恢复原来的状态,自这一现象发表以来,世界各地以提高记录特性为目标一直在进行着研究。
Considering reliability of recording density, holographic storage is valued as the next generation of large-capacity external memory. Now, efforts are being made to develop and systematize photosensitive materials around the world. Here as a recent trend, introduce new materials for reading and writing storage. Most of the original photosensitive materials, like photographic plates, utilize the absorption of light and are used in holographic applications where there is a disadvantage that they can not be overwritten, the diffraction efficiency is low, and processes such as development and fixing are required. In 1968, the Beller Institute in the United States irradiated a laser beam onto a ferroelectric crystal such as lithium niobate. A local refractive index change (photodamage) occurred when light re-radiated onto the crystal or the crystal was heated to 170 ° C Since then, the situation has been restored and since the publication of this phenomenon, studies have been carried out all over the world with the goal of improving the recording characteristics.