高均匀性高掺镁铌酸锂晶体的生长与表征

doi:10.3724/SP.J.1077.2010.01257

无机材料学报 ›› 2010, Vol. 25 ›› Issue (12): 1257-1262.DOI: 10.3724/SP.J.1077.2010.01257 CSTR: 32189.14.SP.J.1077.2010.01257

高均匀性高掺镁铌酸锂晶体的生长与表征

涂小牛, 郑燕青, 陈辉, 孔海宽, 忻隽, 曾一明, 施尔畏

(中国科学院上海硅酸盐研究所, 上海201800)

收稿日期:2010-03-16 修回日期:2010-05-01 出版日期:2010-12-20 网络出版日期:2010-11-24
基金资助:
中科院知识创新工程重要方向项目(KGCX-2-YW-206); 国家863计划(2006AA03Z423); 中科院重大科研装备研制项目(YZ200934)

Growth and Characterization of High Homogeneity Heavily MgO-doped Lithium Niobate Crystals

TU Xiao-Niu, ZHENG Yan-Qing, CHEN Hui, KONG Hai-Kuan, XIN Jun, ZENG Yi-Ming, SHI Er-Wei

(Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China)

Received:2010-03-16 Revised:2010-05-01 Published:2010-12-20 Online:2010-11-24
Supported by:
Knowledge Innovation Program of Chinese Academy of Sciences (KGCX2-YW-206); 863 Program of China (2006AA03Z423); Scientific Research Equipment Project of Chinese Academy of Sciences (YZ200934)

摘要/Abstract

摘要： 采用提拉法生长了高掺镁铌酸锂晶体, 并采用高温极化法使晶体单畴化. 为研究晶体的成分均匀性、光学均匀性及铁电畴均匀性, 采用光谱、激光干涉、电子探针、显微观察等表征手段测定与观察了晶体的紫外吸收边、OH吸收峰、折射率梯度Δn、晶体径向上的微观成分及晶体的铁电畴结构. 结果表明: 通过采用合适的生长组分和改进提拉法生长工艺获得了高质量的高掺镁铌酸锂晶体. 晶体的紫外吸收边位于308 nm附近, OH吸收峰位于高抗光损伤阈值特征峰2828 nm处, 光学均匀性达Δn< 5.11×10^-5. 在1200℃下通过外加电场极化获得了高均匀性且完全单畴的铁电畴结构.

关键词: 高掺镁铌酸锂晶体, 紫外吸收边, OH吸收峰, 畴结构, 光学均匀性

Abstract: High homogeneity heavily MgO-doped lithium niobate (MgLN for short) single crystals were grown by Czochralski method. The as-grown crystals were poled at high temperature, so as to obtain single ferroelectric domain structure. UV absorption edge, OH absorption peak, optical homogeneity of the crystal were tested, respectively. Micro- compositions along the radial direction were analyzed by EDS method and “line scan” of the distribution of Mg element along the radial direction was investigated by WDS method. The results showed that high homogeneity MgLN crystals were obtained with proper starting composition and improved growth process of Czochralski technology. UV absorption edge at 308 nm and OH absorption peak at 2828 nm were observed. The optical homogeneity Δn<5.11×10^-5. Finally, ferroelectric domain structure was observed by optical microscope by chemical etching method. High uniformity single ferroelectric domain structure was obtained by applying an external electric field at 1200℃.

Key words: heavily MgO-doped lithium niobate, UV absorption edge, OH absorption peak, domain structure, optical homogeneity

中图分类号:

涂小牛, 郑燕青, 陈辉, 孔海宽, 忻隽, 曾一明, 施尔畏. 高均匀性高掺镁铌酸锂晶体的生长与表征[J]. 无机材料学报, 2010, 25(12): 1257-1262.

TU Xiao-Niu, ZHENG Yan-Qing, CHEN Hui, KONG Hai-Kuan, XIN Jun, ZENG Yi-Ming, SHI Er-Wei. Growth and Characterization of High Homogeneity Heavily MgO-doped Lithium Niobate Crystals[J]. Journal of Inorganic Materials, 2010, 25(12): 1257-1262.

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高均匀性高掺镁铌酸锂晶体的生长与表征

Growth and Characterization of High Homogeneity Heavily MgO-doped Lithium Niobate Crystals

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