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氟代硼鈹酸钾KBe2BO3F2(KBBF)晶体是至今发现的可相位匹配的倍频波长最短的晶体。但是,由于该晶体具有很大的面间距,层状生长习性十分明显,因此,至今采用熔盐法生长的晶体厚度较薄,无法按照相位匹配方向切割成倍频器件。我们尝试了采用水热法生长KBBF晶体并获得了成功。我们采用水热法已成功地生长出了厚度达10mm以上的透明单晶体。本文概述了水热法生长KBBF晶体的实验方法和生长条件(如矿化剂种类,温度,压力,温度梯度,充满度,开孔率等)对晶体生长的影响。最后,用负离子配位多面体生长基元理论模型讨论了晶体的生长机制与形状。
Potassium fluoroborate beryllium KBe2BO3F2 (KBBF) crystals are the most phase-matched crystal with the shortest octave wavelength found to date. However, since the crystal has a large interplanar spacing, the layered growth habit is very obvious. Therefore, the crystal grown by the molten salt method so far has a relatively small thickness and can not be cut into frequency multiplying devices according to the phase matching. We tried to grow the KBBF crystals hydrothermally and got the success. We have successfully grown by hydrothermal method the thickness of more than 10mm transparent single crystal. This article summarizes the influence of experimental methods and growth conditions (such as the type of mineralizer, temperature, pressure, temperature gradient, fullness, open porosity, etc.) on the growth of KBBF grown by hydrothermal method. Finally, the growth mechanism and shape of the crystal are discussed using the theoretical model of anion coordination polyhedron growth primitives.