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Effect of scattering noise on the data fidelity of holograms recorded in photorefractive crystals

Published online by Cambridge University Press:  21 March 2011

Mingyan Qin
Affiliation:
College of Applied Sciences, Beijing Polytechnic Univ., Beijing 100022, China
Shiquan Tao
Affiliation:
College of Applied Sciences, Beijing Polytechnic Univ., Beijing 100022, China
Guoqing Liu
Affiliation:
College of Applied Sciences, Beijing Polytechnic Univ., Beijing 100022, China
Xiaohong Ding
Affiliation:
College of Applied Sciences, Beijing Polytechnic Univ., Beijing 100022, China
Dayong Wang
Affiliation:
College of Applied Sciences, Beijing Polytechnic Univ., Beijing 100022, China
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Abstract

In this paper a method is proposed to investigate how the scattering noise of photorefractive crystals influences the quality of an input data page in holographic storage. By illuminating the crystal under investigation with an intense coherent light beam, and measuring the signal-to-noise ratio (SNR) of an image formed through the crystal before and after the exposure, the loss of SNR provides a good assessment for the suitability of the crystal for data storage. A variety of doped lithium niobate crystals were investigated. The results show that the intensity of fanning light increases with increase of the doping concentration, but there is no strict correlation between the fanning strength and the fidelity degradation. Owing to the low noise and high data fidelity, iron-and- zinc co-doped lithium niobate crystal is a potential material for high-density holographic data storage.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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Effect of scattering noise on the data fidelity of holograms recorded in photorefractive crystals
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