Floating zone furnace equipped with a high power laser of 1 kW composed of five smart beams
Floating zone furnace equipped with a high power laser of 1 kW composed of five smart beams
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DOI：
10.1016/j.jcrysgro.2019.125435
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发表时间：
2020-03-01
影响因子：
1.8
通讯作者：
Tokura, Yoshinori
中科院分区：
文献类型：
--
作者：
Kaneko, Yoshio;Tokura, Yoshinori
浮区炉是单晶生长的有力工具。本文报道了一台由5束200W加热束组成的1kW高功率半导体激光器浮区加热炉。对于熔化温度在2000℃以上的耐火材料、挥发性物质，甚至是不一致的材料，设计的五束辐照强度分布使单晶能够熔融生长。水平方向的五束光在原料棒的外周上提供均匀的强度，而垂直方向的五束光的功率可以使其具有钟形的照射强度，以缓解生长的单晶中的残余热应力。该炉可直接监测直径1 mm以内的原料热点和熔融区的温度。这种对熔化区温度的在线监测功能大大增强了优化晶体生长条件的可控性。
A floating zone furnace is a powerful tool for single crystal growth. Here, we report the floating zone furnace using a high power diode laser of 1 kW composed of five 200 W heating beams. The five beams with the designed irradiation intensity distribution enable the melt-growth of single crystals for refractory materials having a high melting temperature above 2000 degrees C, volatile materials and even incongruent materials. The power of five beams in the horizontal plane provides uniform intensity in the outer circumference of the raw material rods, while the vertical direction power of five beams can be made to have a bell shape irradiation intensity so as to relax residual thermal stress in the grown single crystal. The present furnace enables one to directly monitor the temperature of the hot spot of raw material and the molten zone within a 1 mm diameter. Such an in-situ monitoring function of the temperature on the molten zone greatly enhances the controllability for optimizing the crystal growth condition.