理解晶体生长机理是硼酸盐非线性光学晶体研究的长期目标之一，该研究对于指导高质量硼酸盐非线性光学晶体生长具有重要意义。目前，硼酸盐非线性光学晶体生长机理的研究主要针对熔体法晶体生长过程，对于助熔剂法晶体生长过程关注较少；另一方面，由于缺少适合的实验手段，我们对晶体生长中阳离子配位结构的信息知之甚少。 本项目首次将荧光探针技术应用于高温熔融晶体生长研究中。根据熔融晶体生长特点，开发出适合高温观测，具有微区分析能力的新型荧光探针光谱技术，并实现对助熔剂法BBO晶体生长中阳离子配位结构的研究。该方法与高温共聚焦拉曼光谱等先进实验手段、第一性原理从头计算的理论方法相结合，使我们能够从原子尺度和材料的微结构本质解释BBO晶体助熔剂法生长微观机理、助熔剂在BBO晶体生长中的作用机制。本研究为完善硼酸盐晶体生长基元模型，探索新型助熔剂化合物、设计高质量硼酸盐晶生长工艺提供理论指导。

Understanding crystal growth mechanisms is a long-term goal of researches on non-linear optical borate crystals, which would have great significance for improvement of growth technologies of high quality nonlinear optical borate crystals. Until now, mechanism investigations of nonlinear optical borate crystal growths have been mainly focused on the cases from the high-temperature melts, but, less involved in crystal growths from the high-temperature solutions; on the other hand, due to lack of suitable probing method, the coordination structures of cations are poorly understood. In this research, fluorescence probing technique would be firstly applied to mechanism studies of crystal growths from the high temperature melt/solution. A new fluorescence spectroscopy would be developed for measurements at high temperature, which has an ability of microscale analysis. Using the new technique, coordination structures of cations in BBO crystal growths would be studied. Combining with Raman spectroscopy and Ab initio calculations, we would explain mechanisms of BBO crystal growths in high-temperature solution at molecular scale, and summary the reasons of various fluxes for adaption to borate crystal growths. These obtained results could be provided as experiment references for the optimization of borate crystal growth unit model, and for the discovery of new type fluxes which could improve growth technologies for high quality borate crystal growths.