新型激光晶体Yb:KY(WO4)2的结构与光谱

采用顶部籽晶提拉法，以K₂W₂O₇为助溶剂，生长了Yb:KY(WO₄)₂新型激光晶体.经热重-差热分析，确定晶体熔点为1045℃，相变温度为1010℃.X射线粉末衍射测试，验证所生长的晶体为β-Yb:KY(WO₄)₂.晶体结构分析确定Yb:KY(WO₄)₂晶体由WO₆八面体连接而成，WO₆八面体是由双氧桥(WOOW)及单氧桥(WOW)构成.晶体粉末样品室温下的红外及拉曼光谱测试，确定WO₆原子基团、双氧桥及单氧桥的振动频率.晶体的吸收峰位于940nm，980nm，发射峰位于989nm—1030nm.关键词：晶体结构光谱晶体生长

Structure and spectrum of the novel laser crystal Yb:KY(WO4)2

The selection of the flux and the design of the proper process are the key factors for the growth of Yb：KY(WO₄)₂ laser crystal. Yb：KY(WO₄)₂ crystal is grown by top seeded solvent growth (TSSG) method using K₂W₂O₇ as a suitable flux. On the basis of TG-DTA, which has two obvious absorption peaks at 1045℃ and 1010℃, the Yb：KY(WO₄)₂ crystal's melting point is 1045℃, phase transition point from tetragonal system to monoclinic system is at 1040℃. Analyzing the X-ray diffraction spectrum of Yb：KY(WO₄)₂ crystal powder sample, we can conclude that the β-Yb：KY(WO₄)₂ crystal is of monoclinic system, and C2/c space group. The Yb：KY(WO₄)₂ crystals structure forms from the WO₆ octahedra joined by WOOW double oxygen bridges and WOW single bridges. The IR and Raman spectra showed, the atom group WO₆ has flex vibrations at 931cm^-1，925cm^-1, 891cm^-1 and 840cm^-1, and bend vibrations at 395cm^-1，369cm^-1，346cm^-1 and 312cm^-1, the WOOW double oxygen bridge has vibrations at 901cm^-1, 759cm^-1, 686cm^-1, 435cm^-1, 496cm^-1 and 298cm^-1, and the WOW single bridges has vibrations at 809cm^-1, 525cm^-1 and 235cm^-1. At room temperature, the absorption peaks are at 940nm and 980nm the emission peaks are at 989nm—1030nm.