硒铟锂(LiInSe2, LISe)晶体在长波红外激光领域有重要应用价值。目前高质量、大尺寸LISe晶体的稳定生长仍然面临挑战, 通过气氛退火后处理工艺能够有效提高晶体光学质量。本文采用定向籽晶垂直布里奇曼法, 通过精确控制籽晶熔接, 实现大尺寸(40 mm×60 mm)LISe晶体的批量稳定制备, 为目前国际上报道的最大尺寸LISe晶体。另外, 系统探索了LISe晶体的退火工艺, 研究表明在740 ℃、LISe本征气氛下退火150 h, 可以明显提高LISe晶体器件光学质量。

Lithium selenoindate (LiInSe2, LISe) crystal has important application in the field of long-wave infrared lasers output. At present, it is still a challenge for the growth of large sized and high quality LISe crystals. The optical quality of crystals are improved by atmosphere annealing post-growth treatment. Large sized (40 mm×60 mm)LISe crystals were grown in batch by the vertical Bridgman method using oriented seed with precise control of seed crystal welding. To the best of our knowledge, it is the largest one for the reported LISe crystals. In addition, the annealing process of LISe crystal was systematically explored, and the results indicate that the optical quality of LISe crystal can be significantly improved by annealing at 740 ℃ for 150 h under LISe intrinsic atmosphere.