非真空密闭条件下的Ce3＋：LiYF4晶体生长  

Growth of Ce^(3+):LiYF_4 Crystal under Non-vacuum Closed Atmosphere

作　　者：徐方[1] 方奇术[1] 王苏静[1] 武安华[2] 蒋成勇[1] 陈红兵[1] 

机构地区：[1]宁波大学材料科学与工程研究所,宁波市新型功能材料及其制备科学国家重点实验室培育基地,宁波315211 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《人工晶体学报》2009年第4期813-817,共5页Journal of Synthetic Crystals

基　　金：宁波市自然科学基金项目(No.2009A610012);浙江省高校中青年学科带头人项目;宁波大学王宽诚幸福基金资助项目

摘　　要：本文报道了氟化物激光晶体Ce3+∶LiYF4的坩埚下降法生长工艺。以高纯氟化物LiF、YF3和CeF3为初始试剂,按照LiF∶YF3∶CeF3=51.5∶47.5∶1.0的物质的量比配料,经高温氟化处理合成严格无水的Ce3+∶LiYF4多晶料。将Ce3+∶LiYF4多晶料密封于铂坩埚中,添加少量聚四氟乙烯粉末,可避免氟化物熔体的氧化与挥发,从而在非真空条件下实现Ce3+∶LiYF4晶体的坩埚下降法生长,成功生长出尺寸达28 mm×70 mm的无色透明完整单晶。采用XRD、差热/热重分析、透射光谱和荧光光谱对Ce3+∶LiYF4单晶基本性质的进行表征。结果表明,该晶体在320~3000 nm区域内的光透过率达90%以上,晶体在297 nm处有一强吸收峰;荧光光谱显示晶体在紫外光区310nm、325 nm处有两个强发射峰。The growth process of fluoride laser crystal Ce3 ＋ ： LiYF4 by Bridgman method is reported in this paper. Using LiF, YF3 and CeF3 as the initial agents, the material for the crystal growth was prepared according to the molar ratio of LiF ： YF3 ： CeF3 = 51. 5 ： 47. 5 ： 1. O. The anhydrous Ce3 ＋ ： LiYF4 polycrystalline material was synthesized by fluoridation process at elevated temperature. By means of sealirrg the feed material in a platinum crucible, Ce3 ＋ ： LiYF4 crystal could be grown by vertical Bridgman method in a non-vacuum atmosphere to avoid the oxidization and volatilization of the melt. A transparent Ce3＋： LiYF4 crystal with size of Φ28 mm× 70 mm had been grown successfully. The crystal was characterized by XRD, DTA/TG, transmission spectrum and fluorescence spectrum. The transmission spectrum indicates a high optical transmittance of more than 95% in the wavelength range of 320-3000 nm and a strong absorption peak at 297 nm. The fluorescence spectrum shows two strong emission peaks at 310 nm and 325 nm in the ultraviolet range.

关 键 词：激光晶体 Ce3+∶LiYF4 氟化处理 晶体生长 坩埚下降法 

分 类 号：O782[理学—晶体学]