感应加热温场上移法—一种新的梯度法晶体生长技术

INDUCTION HEATING AND THERMAL FIELD UP-SHIFT METHOD(ITUM)——A NEW CRYSTAL GROWTH TECHNIQUE

介绍了一种新的温度梯度法晶体生长技术,称为“感应加热温场上移法”(induction heatingand thermal field up-shift method,ITUM),该法是用钼坩埚在氢气气氛下直接感应加热,使其中的原料熔化。保持坩埚不动,通过线圈的上移,实现熔体的凝固结晶。已用这种方法成功地长出光学质量良好的掺钛氧化铝可调谐激光晶体。本文介绍这种方法的工艺装置和生长过程,给出初步的激光实验和晶体质量的检测数据:对于从熔体中生长高温晶体具有重要的意义。

A new crystal growth technique named Induction heating and thermal field up-shift method (ITUM) has been developed in our laboratory. In this method a molybdenum crucible is directly induced by RF generator in hydrogen atmosphere for melting the material inside and then the RF coil is moved upward while the crucible is kept at rest, so that the solid-liquid interface will move from the bottom to the top of the crucible to accomplish the crystallization process. Titanium doped sapphire laser crystals of φ56×40mm have been grown by this technique successfully. The growth apparatus and growth process as well as the preliminary laser performance and evaluation of the crystal quality are presented in this paper.