RECORDING AND READING OF VOLUME HOLOGRAMS IN DIFFRACTION-LIMITED SYSTEMS.

被引：0
|
作者：
Schoennagel, H.
机构：
来源：
Soviet Journal of Quantum Electronics (English translation of Kvantovaya Elektronika) | 1975年 / 5卷 / 08期
关键词：
DATA STORAGE; OPTICAL;
D O I：
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中图分类号：
学科分类号：
摘要：
The use of thick layers for recording purposes in holographic memory devices makes it possible to increase the diffraction efficiency and the memory capacity. A simple approximation is used to analyze the recording and reading of individual volume holograms with the aid of a diffraction-limited aperture. Some features not found in thin-film holograms are revealed by this analysis. For example, the average diffraction efficiency of thin-film holograms is inversely proportional to the size w//k of the spot formed by the reconstructing (read) beam. The corresponding dependence for thick-film (volume) holograms has a maximum but in the range of small values of w//k a direct proportionality is observed. In the plane of incidence the dimensions of spots formed by the signal and reconstructing beams are equal. At right-angles to this plane the spot size is less for the reconstructing beam, i. e. , the distribution is asymmetric.
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页码：877 / 883
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