紫外激光在光刻、光电子能谱、仪器精密加工等领域拥有广泛应用前景，而紫外非线性光学晶体是获得紫外激光的关键材料。硼酸盐和磷酸盐具有丰富的结构化学、大倍频效应和短紫外截止边，是紫外非线性光学材料设计的理想选择。申请人前期将硼酸盐与磷酸盐结合制备出倍频效应达4×KDP、紫外截止边为180nm的硼酸-磷酸盐Ba3(ZnB5O10)PO4(BZBP)，初步性能测试表明该晶体在355nm激光输出方面具有潜在应用前景。本项目拟采用顶部籽晶法生长BZBP晶体，重点解决晶体生长过程中由于高体系粘度导致的晶体生长缓慢，易产生包裹及云层等宏观缺陷，稳定生长出可供355nm固体激光器性能测试用40×40×20mm3高质量晶体，加工单晶器件，系统评估其在355nm激光输出应用中的非线性光学系数、走离角、激光损伤阈值及折射率温度色散关系，为355nm激光输出提供一种新的备选材料，同时为高粘度体系晶体生长提供技术借鉴。

UV laser has wide application prospects in the fields, such as lithography, photoelectron spectroscopy, precision machining, etc. UV nonlinear optical crystal (NLO) is the core material of solid-state laser for producing short wavelength laser. Borates and phosphates have abundant structure chemistry, large second harmonic generation (SHG) response and short ultraviolet cut-off edge. They are ideal choice for the design of new UV NLO materials. In applicant’s previous study, a new borate-phosphate NLO material Ba3(ZnB5O10)PO4 (BZBP) has been successfully designed and synthesized by combining borate group and phosphate group in a material. This material has a large SHG response (4×KDP) and a short UV cut-off edge (180 nm). The primary research indicates that BZBP is a promising NLO crystal for 355 nm laser output. In this research, we will optimize the parameters of BZBP crystal growth and overcome the high viscosity of BZBP melt, which may lead to slow crystal growth, inclusions and clouds, and grow the high quality of BZBP crystal with a size not less than 40×40×20 mm3. With the grown high quality crystal, we will process the crystal devices and measure the NLO coefficients, walk-off angle, laser damage threshold, and refraction of rate of temperature dispersion relation. These researches will not only provide a new alternative material for 355 nm laser output, but it is also helpful for the crystal growth in other system with a high viscosity.