用顶部籽晶提拉法, 以K2W2O7为助溶剂, 生长Yb:KGd(WO4)2激光晶体. 经热重-差热分析, 确定晶体熔点为1086℃, 相变温度为1021℃. 晶体结构分析确定Yb:KGW(WO4)2晶体由WO6八面体连接而成, WO6八面体是由(WOOW)双氧桥及(WOW)单氧桥构成. 晶体粉末样品室温下的红外及拉曼光谱测试, 确定WO42-、双氧桥及单氧桥的振动范围, 并对其进行了归属. X射线粉末衍射测试, 验证所生长的晶体为β-Yb:KGd(WO4)2.
The selection of the flux and the design of the proper processes are the key factor for the growth of Yb:KGd(WO4)2 laser crystal. Yb:KGd(WO4)2 crystal was grown by the Top
Seeded Solvent Growth (TSSG) method using K2W2O7 as a suitable flux. On the base of TG-DTA, the crystal has two obvious absorption peaks at
1086℃ and 1021℃, its melting point is 1086℃, phase transition temperature from tetragonal to monoclinic is 1021℃. The Yb:KGd(WO4)2
crystal consists of WO6 octahedra which consists of WOOW double oxygen bridges and WOW single bridges. IR and Raman spectra show the atom
group WO42- flex vibration at 436 cm-1 and atom group WO42- bend vibration at 740～925cm-1, WOOW double oxygen bridge vibration at 903, 765, 684, 438, 498 and 297cm-1, WOW single
bridges vibration at 808, 526 and 232cm-1. Analyzing on the X-ray diffraction spectrum of Yb:KGd(WO4)2 crystal powder sample, we can
conclude that the β-Yb:KGd(WO4)2 crystal is of a monoclinic system, and C2/c space group.
参考文献
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