| 摘要 |
PURPOSE: To enable the growth of barium borate(BBO) long single crystal of high quality without grain boundary and inclusion by the pulling-up process using a seed crystal having the upward phase-matching direction. CONSTITUTION: In the growth of BBO single crystal by the pulling-up process using a seed crystal 1 which is processed so that it has the phase-matching direction inclined byθfrom the axis (c), the single crystal is grown without drastic fluctuation of heat-flow conditions at the growing boundary face, as the interval of the crystal habit 2 is kept at a certain period, by allowing the temperature of the melt to fall down at a constant rate regardless of the diameter fluctuation of the crystal grown since before the crystal habit occurs, after the seed crystal is allowed to contact with the melt.
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