BBO单晶生长过程中气相包裹体形成的实时观察研究

BBO单晶生长过程中包裹体的出现是影响晶体质量及制约晶体尺寸的一个重要因素,利用高温休伦微分干涉显微技术，实时观察了BBO助溶剂法生长过程中出现的气相包裹体的形成过程．结果表明，包裹体产生于完美晶体内部，并趋向于分布在界面附近，单晶生长过程中台阶的发展将有助于制约气相包裹体的形成和分布．

In Situ Observation on Generation of Gaseous Inclusions in BBO Crystal

The inclusions in BBO single crystal can influence the ultimate crystal size as well as crystal properties. In this paper, the generation process of inclusions in BBO crystal by flux method is observed using Schlieren technique coupling with differential interference microscope.Results show that gaseous inclusions usually form at the inner part of perfect crystals and distribute near the interface. These indusions over generated originally from some small hexagonal cells. The formation and distribution of inclusions are significantly influenced by the development of crystal steps. The steps height and width may strongly constrain the develpment of inclusions, which results in the formation of inclusion clusters on the steps. The possible mechanism of inclusion generation is also discussed. It is noted that the main reason caused inclusions is the volatilization of some elements at high temperature.