Nd∶KGd(WO_4)_2激光晶体生长  

LASER CRYSTAL GROWTH OF Nd∶KGd(WO_4)_2

作　　者：刘景和[1] 李建利[1] 洪元佳[1] 李艳红[1] 徐斌[1] 张亮[1] 刘祥[1] 

机构地区：[1]长春光学精密机械学院材料工程系,长春130022

出　　处：《硅酸盐学报》2001年第3期254-258,共5页Journal of The Chinese Ceramic Society

摘　　要：以K2 W2 O7为助熔剂 ,采用熔盐顶部籽晶 (TSSG)法生长出尺寸为 2 3mm× 2 0mm× 19mm的Nd∶KGd(WO4) 2 激光晶体 .比较了K2 WO4和K2 W2 O7两种助熔剂的性能及对晶体生长的影响 ,认为K2 W2 O7熔点较低可以有效地降低晶体生长温度 ,有利于控制晶体生长和生长环境 .进行了KGd(WO4) 2 -KNd(WO4) 2 系统二元相图的研究 ,认为两者互溶性好 ,有利于晶体生长 ,并且Nd3+ 易于以化学剂量比取代Gd3+ .采用XRD、偏光显微镜及TG -DTA对晶体性能进行了研究 ,实验表明所生长的晶体为高温相的 β -Nd∶KGW .用光学显微镜对晶体表面裂纹、生长条纹、生长丘、生长台阶和包裹物等缺陷进行了观察 ,认为它们形成的原因是由于晶体生长工艺不稳定 ,温度梯度过大 。Nd:KGd[WO4]2 laser crystal with dimensions of mm×20 mm × 19 mm was prepared by TSSG method. The phase and effect to crystal growth of K2W2O7 are analyzed. It is found that K2W2O7 decreases the crystal growth temperature due to its melt point. The phase diagram of KGd(WO4)2 binary system was also analyzed. It is concluded that they have enough mul-dissolve and Nd3+ can replace Gd3+ easily. Nd:KGW is identified as a high temperature phase by XRD, micropolariscope and TG-DTA. The crystal defects of surface cracking, grow strips, grow mount, grow steps, and parcel are also observed and the reasons are attributed to the unstable control of crystal growth, the high temperature gradient, the fast cooling rate and the high drawing rate.

关 键 词：掺钕 钨酸钾钆激光晶体 助熔剂 晶体生长 

分 类 号：O782[理学—晶体学] TN244[电子电信—物理电子学]