Theoretical studies on nonvolatile two-step, two-color holographic recording sensitivity for LiNbO₃:Fe

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• 作者：Yan Shen ; Guoquan Zhang ; Bo Fu ; Qingjun Xu and Jingjun Xu
• 关键词：Holography ; Nonvolatile ; Lithium niobate ; Sensitivity
• 刊名：Optics Communications
• 出版年：2005
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：2005
• 卷：256
• 期：1-3
• 页码：24-34
• 文件大小：205 K

摘要

The effects of material and experimental parameters on the nonvolatile two-step, two-color holographic recording sensitivity for LiNbO₃:Fe have been studied theoretically based on a two-center model. We have taken into account the direct electron transfer between the deep-trap center Fe²⁺/Fe³⁺ and the shallow-trap center due to the tunneling effect. The results show that the direct electron transfer between the Fe²⁺/Fe³⁺ and the centers plays a key role in the improvement of two-step, two-color holographic recording sensitivity. The near-stoichiometric LiNbO₃:Fe has been confirmed theoretically to be of higher recording sensitivity and larger dynamic range than the congruent one in the low intensity region. A further improvement of the recording sensitivity can be achieved by employing appropriate doping concentration and thermal reduction treatment of Fe and/or selecting appropriate gating and recording wavelengths with large photo-excitation cross-sections.