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Proceedings Paper

A practical method of suppressing photovoltaic noise in Fe:LiNbO3
Author(s): Yuhong Wan; Lei Zhang; Guoqing Liu; Shiquan Tao
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Paper Abstract

A practical method of suppressing photovoltaic noise in photorefractive iron doped lithium niobate crystals (Fe:LiNbO3) is proposed, in which the surfaces of the crystal are coated with transparent electric-conductive material (In2O3 doped stannum, ITO) forcing the crystal to operate in a short-circuit mode. In order to assess the validity of this method, the loss of signal-to-noise ratio (LSNR) was used to evaluate the quality of images formed directly through uncoated and ITO- coated crystals respectively. Several iron doped lithium niobate crystals were measured. The main experimental results showed that the scattering noise decreased obviously in the ITO-coated crystals, suggesting that the short-circuit operation suppressed photovoltaic noise effectively. Furthermore, it is found that the dynamic range (M#) of the crystals increased after they were coated with ITO. The results of experiments on multiple hologram recordings in the uncoated and ITO-coated Fe:LiNbO3 crystal verified the improvement of M# well.

Paper Details

Date Published: 3 January 2005
PDF: 8 pages
Proc. SPIE 5643, Advances in Optical Data Storage Technology, (3 January 2005); doi: 10.1117/12.573944
Show Author Affiliations
Yuhong Wan, Beijing Univ. of Technology (China)
Lei Zhang, Beijing Univ. of Technology (China)
Guoqing Liu, Beijing Univ. of Technology (China)
Shiquan Tao, Beijing Univ. of Technology (China)

Published in SPIE Proceedings Vol. 5643:
Advances in Optical Data Storage Technology
Duanyi Xu; Kees A. Schouhamer Immink; Keiji Shono, Editor(s)

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