【摘要】 本文采用提拉法(CZ)生长了Nd:GGG晶体,并从理论上讨论了包裹物、提拉速度、晶体转速和降温速率等因素对晶体开裂的影响,最后给出了生长无开裂Nd:GGG晶体的最佳工艺参数:径向温度梯度越小越好,纵向温度梯度在0. 5℃/mm,提拉速度2~4mm/h,晶体转速20~40r/min,降温速率不超过20℃/h。通过设计合理而稳定的温场、选择最佳工艺参数及退火处理等方法,较好地解决了Nd:GGG晶体开裂问题。更多还原

【Abstract】 A Nd: GGG crystal was grown by CZ method.The crystal cracking was studied and the results show that the crystal cracking is related to package, pulling rate,speed of rotation and cooling speed. At last,the optimum growth parameters of Nd: GGG crystal were given:the smaller the radial temperature gradient, the better the crystal.The axial temperature gradient of in-solid-liquid interface is 0.5℃/mm,the pulling speed 2-4mm/h,the rotation rate 20-40r/min,and the cooling speed 20℃/h.A perfect crystal was grown by designing stable temperature field,selecting rational technology parameters and annealing process.更多还原