Structure and nonvolatile holographic recording of Mg:Ce:Cu:LiNbO₃ crystals

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• 作者：Yexia Fan ; Hongtao Li ; Fengyun Guo ; Yuheng Xu ; Liancheng Zhao
• 关键词：Lithium niobate ; Photorefractive properties ; Absorption edge
• 刊名：Optics Communications
• 出版年：2007
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：15 October 2007
• 卷：278
• 期：2
• 页码：413-417
• 文件大小：196 K

摘要

A series of Mg:Ce:Cu:LiNbO₃ crystals has been grown by Czochralski method. Their infrared transmittance spectra and ultraviolet–visible absorption spectra were measured and discussed to investigate their defect structure. The nonvolatile holographic recording of Mg:Ce:Cu:LiNbO₃ crystals was characterized by the two-photon fixed method. We found that the recording time of Mg:Ce:Cu:LiNbO₃ crystals became shorter and nonvolatile diffraction efficiency decreases with the increase of Mg doping concentration, especially doping with Mg approaches and exceeds the so-called threshold. And the nonvolatility vanishes when the concentration of MgO exceeds 4 mol%. The intrinsic and extrinsic defects were discussed to explain the nonvolatile holographic properties in the Mg:Ce:Cu:LiNbO₃ crystals.