摘要
掺镱钨酸钇钠 [分子式 :Yb :NaY (WO4) 2 ,简称Yb :NYW ]是一种性能优良的激光晶体。本文采用提拉法生长出四方晶系白钨矿结构的Yb :NYW晶体 ,尺寸为 2 0mm× 2 0mm。对生长的晶体中存在的开裂现象进行了研究 ,从理论上讨论了晶体中的热应力和热应变与晶体尺寸、温度梯度、提拉速度和转速等生长工艺参数之间的关系。实验研究发现 ,晶体开裂与生长速度过快、转速过大、晶体冷却速率过快所造成的热应力有关。
Yb:NaY(WO 4) 2 [abbreviated as Yb:NYW] single c ry stal is a kind of new type laser crystals that has an excellent scintillating pr operties. In this work,high quality Yb:NYW single crystal of 20 mm in diameter and 20 mm in length was grown by Czochralski method. The phenomenon of cracking in the Yb:NYW crystal was investigated. The relationships between manufacturing parameters, the thermal stress and strain in the crystal, and growth parameters such as size of crystal, temperature gradient,pulling rate and rotating rate et c. are also discussed. Experimental results indicate that the crystal cracking is related to the thermal stress that results from over growing rate, rotating rate and cooling rate of crystals. The optimum technical parameters for growin g crack-free Yb:NYW crystals are presented.
出处
《长春理工大学学报（自然科学版）》
2003年第4期16-18,15,共4页
Journal of Changchun University of Science and Technology(Natural Science Edition)
基金
吉林省自然科学基金项目
