Defect structure and photorefractive properties of In:Eu:Fe:LiNbO₃ Crystals with various Li/Nb ratios

详细信息	查看全文 | 推荐本文 |

• 作者：Liang Sun ; Fengyun Guo ; Qiang Lv ; Hongtao Li ; Wei Cai ; Yuheng Xu ; Liancheng Zhao
• 关键词：A2. Czochralski methold ; B1. Lithium compound ; B2. Photo-refracitve materials
• 刊名：Journal of Crystal Growth
• 出版年：2007
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：15 September 2007
• 卷：307
• 期：2
• 页码：421-426
• 文件大小：231 K

摘要

In: Eu: Fe: LiNbO₃ crystals were grown by the Czochralski technique with various ratios of Li/Nb =0.946, 1.051, 1.200, 1.382 in the melt. The crystal composition and defect structure were analyzed by the UV-visible and IR spectroscopy and X-ray diffration. The results showed that increasing the Li/Nb ratio can decrease the In³⁺ doping threshold concentration of In: Eu: Fe: LiNbO₃ crystals. In two-wave coupling experiments, the writing and erasure time constants, maximum diffraction efficiency, photorefractive sensitivity, photoconduction, photovoltaic field and space-charge field of the crystals were measured and calculated. The dependence of the photorefractive properties on the defect structure of In: Eu: Fe: LiNbO₃ crystals were discussed.