大尺寸Nd,Ce∶YAG激光晶体的生长及缺陷研究

Growth and Defects of Large Size Nd,Ce∶YAG Laser Crystal

双掺Nd,Ce∶YAG晶体相比传统的Nd∶YAG具有输出能量高、激光振荡阈值低的优点。近几年高能效固体激光器的发展对大尺寸、高质量Nd,Ce∶YAG晶体的需求越来越大。采用提拉法生长大尺寸Nd,Ce∶YAG时,极易出现包裹物和开裂缺陷。本文通过理论与实践相结合的方式分析了晶体在生长过程中产生缺陷的原因,并提出了解决办法,成功生长出直径50 mm等径长150 mm的高质量Nd,Ce∶YAG单晶。本研究可为批量化生长大尺寸Nd,Ce∶YAG晶体的质量改进提供方向和指导。

Compared with the traditional Nd∶YAG,the co-doped Nd,Ce∶YAG crystal has the advantages of high output energy and low laser oscillation threshold.In recent years,the development of high energy efficiency solid-state lasers requires more and more large size and high-quality Nd,Ce∶YAG crystals.When large size Nd,Ce∶YAG is grown by Czochralski method,inclusion and cracking defects are very easy to occur.In this paper,the reason of the defects formation during the crystal growth were analyzed by combining theory with practice,and the solutions were put forward.Finally,high-quality Nd,Ce∶YAG single crystal with a diameter of 50 mm and an equal length of 150 mm was successfully grown.The results can provide direction and guidance for the quality improvement of mass production of large size Nd,Ce∶YAG crystals.