Pulling of Shaped Sapphire Crystals with Controlled Dopant Profiles by Modified Edge-Defined Film-Fed Growth and Noncapillary Shaping Methods

摘要

The edge-defined film-fed growth and noncapillary shaping methods are modified to grow chemi- cally modulated, shaped sapphire crystals. Al_2O_3/Al_2O_3:Ti~3+(Cr~3+) crystals combining different dopant distri- butions and free of gaseous and solid inclusions are grown. The Ti and Cr concentrations in the undoped and doped regions are 10~-4 and 0.1 wt /100, respectively.