新型混卤卤化物中红外非线性光学材料的设计合成与性质研究

项目名称： 新型混卤卤化物中红外非线性光学材料的设计合成与性质研究

项目编号： No.21301132

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 李艳军

作者单位： 武汉科技大学

项目金额： 24万元

中文摘要： 中红外波段非线性光学晶体材料是高新技术的关键材料之一，由它做成的器件可广泛应用于频率转换、激光通讯、环境监测和光电对抗等方面。目前，商品化的中红外非线性光学晶体材料由于它们的半导体特性，其激光损伤阈值偏低，无法满足高功率激光的应用要求。研究具有高激光损伤阈值的中红外非线性光学新晶体材料是现在非线性光学晶体材料领域的前沿课题。卤化物为绝缘体，具有宽的带隙，可使其具有高激光损伤阈值，而混卤的分子设计可使设计的化合物具有较大的宏观非线性光学效应。本课题提出从混卤卤化物中探索新的中红外波段非线性光学晶体材料，以提高激光损伤阈值为主要研究方向，兼顾中红外波段的透光范围和非线性光学性能，研究新型混卤卤化物的合成、结构鉴定、各种性能和晶体生长，探索出几个潜在的中红外波段二阶非线性光学新晶体材料，深入探讨化合物的合成、结构与性能的关系，实现混卤卤化物的合理设计与可控制备。

中文关键词： 非线性光学晶体材料；高激光损伤阈值；中红外波段；卤化物；构效关系

英文摘要： Nonlinear optical (NLO) crystal materials in the Middle infrared (Mid-IR) region are one of key materials in high technology. These NLO crystal materials can be widely used in laser frequency conversion, optical communication, infrared monitoring and national defense. Yet the application of the commercial available NLO crystals used in the Mid-IR region was limited for their comparatively low laser damage threshold resulting from semiconductor characteristics. The search for new NLO crystal materials with high laser damage threshold is of great importance and has become one of the great challenges in the field of materials science. Halides usually show comparatively large band gaps evidenced by their insulating characteristics, and possess high laser damage threshold and the signed compounds with mixed-halogen can generate larger macroscopic nonlinear optical effects. This subject is to search for the new excellent NLO materials from the mixed-halogen halides utilized in the Mid-IR region. We focus on the high laser damage threshold, and balance the transmittance in the Mid-IR region and the NLO properties. The synthesis, structure identification,a variety of properties and crystal growth are studied. We hope to obtain few new NLO crystal materials with good comprehensive properties, and explore the relationship

英文关键词： nonlinear optical crystal materials；high laser damage threshold；middle infrared region；halides；relationship between structure and property