深紫外非线性光学晶体RbBa2(PO3)5的提拉法生长和性能研究

项目名称： 深紫外非线性光学晶体RbBa2(PO3)5的提拉法生长和性能研究

项目编号： No.51502288

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 赵三根

作者单位： 中国科学院福建物质结构研究所

项目金额： 21万元

中文摘要： 紫外、深紫外非线性光学（NLO）晶体研究及相关产业属于我国传统优势领域。目前常用的紫外、深紫外NLO晶体都采用助熔剂法生长，生长周期较长。我们发现的RbBa2(PO3)5晶体具有已知深紫外磷酸盐中最短的紫外吸收边和最大的粉末倍频效应，这两项性能均和目前唯一可用的深紫外NLO晶体KBBF相当；同时，该晶体同成分熔融，可采用生长周期较短的提拉法生长，作为紫外特别是深紫外NLO 晶体具有潜在应用前景。本项目拟对该晶体的生长形貌和缺陷形成机制等进行微观观察，找到影响其生长的关键因素，实现其大尺寸单晶的提拉法快速生长；利用生长的大尺寸单晶，测试其各项热学性质；针对该晶体的晶体学低对称性，结合不同测量方法精确测试其折射率、倍频系数等光学性质，进而制作出其倍频器件；利用该器件开展初步的激光倍频实验，评估其应用前景。本项目的顺利实施，有望推动我国紫外、深紫外NLO晶体研究向可快速制备方向发展。

中文关键词： 晶体；无机化学；非线性光学材料

英文摘要： China has traditional advantages on the researches and associated industries of UV and deep-UV nonlinear optical (NLO) crystals. Nowadays, the commonly used UV and deep-UV NLO crystals are grown by the flux method, which always costs a long time during the growth period. Recently, we discovered a new crystal RbBa2(PO3)5 that possesses the shortest UV absorption edge and the largest powder second-harmonic generation (SHG) response (among deep-UV transparent phosphates), both which are comparable to those of the sole available deep-UV NLO crystal KBBF. Furthermore, this crystal melts congruently, indicating that it could be grown by the Czochralski method, a method with relatively short growth period. Therefore, the RbBa2(PO3)5 crystal has potential prospects as a NLO material in UV, in particular, deep-UV region. This project will make microscopic observations on the growth morphologies and the mechanisms of defect production for the RbBa2(PO3)5 crystal, and then find out the key factor with respect to the growth of bulk single crystals, thereby realizing the rapid growth of bulk RbBa2(PO3)5 crystals by the Czochralski method. Using the as-grown bulk crystals, the thermal properties will be systematically measured. As the RbBa2(PO3)5 crystal has a low crystallographic symmetry, we will combine different measurement methods to accurately measure the optical properties including refringence, SHG coefficients, and so on, and then manufacture the SHG devices according to the as-obtained optical parameters. Finally, the SHG devices will be used to carry out primary laser SHG experiments, for the sake of the prospect evaluation of this crystal. We believe that this project will put forward the researches on UV and deep-UV NLO crystals to the direction of rapid production.

英文关键词： crystal;inorganic chemistry;nonlinear optical materials