新型紫外非线性光学晶体Ba3B6O11F2的助熔剂法生长及性质研究

项目名称： 新型紫外非线性光学晶体Ba3B6O11F2的助熔剂法生长及性质研究

项目编号： No.51302307

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 韩树娟

作者单位： 中国科学院新疆理化技术研究所

项目金额： 25万元

中文摘要： 紫外激光光源在光刻、医疗、光谱分析和精密机械加工等领域具有广泛的应用，紫外非线性光学晶体是获得紫外激光光源的关键材料。 本课题组将F离子引入Ba-B-O体系，首次合成出一种新型紫外非线性光学晶体Ba3B6O11F2，其透光波段宽，紫外截止边低于190 nm，倍频效应约为3倍KDP，能实现相位匹配。本项目拟采用助熔剂顶部籽晶法生长Ba3B6O11F2晶体，探索合适的助熔剂体系，避免生长过程中稳定相BBO的形成；分析温场、溶液浓度、降温程序、晶转速度、生长过程中溶质输运动力学以及籽晶对晶体生长的影响；研究晶体生长过程中产生的缺陷，探讨晶体缺陷的形成机制；通过优化生长工艺参数获得可供性能测试表征的晶体；测试热学、线性和非线性光学性质；揭示结构基元与性能间的关系，综合评估其在紫外波段的应用前景。 该晶体的成功研制，为氟硼酸盐晶体的生长提供技术借鉴，拓展了新型紫外非线性光学晶体的种类。

中文关键词： 紫外非线性光学晶体；顶部籽晶法；双折射率；类钙钛矿；

英文摘要： Ultraviolet (UV) lasers have potential applications in the areas of photoetching, medical treatment, spectroscopic analysis and precision machining and so on. UV nonlinear optical crystals are the key materials to obtain the UV lasers light source. In our research, a new UV nonlinear optical crystal, Ba3B6O11F2, has been synthesized by introducing F anion into the Ba-B-O system. It exhibits a wide transparency range with a short UV cut-off edge (lower than 190 nm). It possesses a SHG response about three times that of KDP and is phase-matchable. In this project, we will investigate the top-seeded solution growth of Ba3B6O11F2 crystal, explore the suitable flux system to avoid the formation of the stable phase BBO; analyse the effect of temperature field, solution concentration, cooling rate, crystal revolution speed, solute transport dynamics and crystal seed to the crystal growth; investigate the formation mechanism of the crystal defects formed in the growth process; obtain transparent Ba3B6O11F2 crystal used for measurment by optimizing the growth process parameters; measure its thermal, linear and nonlinear optical properties; reveal the relationship between structure and properties, and evaluate the application prospect of Ba3B6O11F2 in the UV areas. The investigations of the crystal will provide technical

英文关键词： UV nonlinear optical crystal；top-seeded growth method；birefringence；perovskite-related；