| 摘要 |
PURPOSE:To prepare a single crystal uniformly doped in the crystal in the process for synthesizing single crystal by the light collecting floating zone method by increasing the concn. of a doping agent at a tip part of a starting material bar. CONSTITUTION:In the prior art for synthesizing a single crystal by the light collecting floating zone method, unifrm doping has failed frequently, resulting in low concn. of the doping agent in the initial stage and gradually increasing the concn. of the doping agent as the growth of the single crystal proceeds if a doping agent having a small distribution coefft. in the mother crystal and a starting material bar having uniform concn. of the doping agent are used. Uniform concn. of the doping agent in the whole part of the crystal has become possible by increasing the concn. of the doping agent at the tip of the starting material bar.
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