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采用改进的温梯法生长氟化钙晶体

CALCIUM FLUORIDE CRYSTAL GROWTH WITH IMPROVED TEMPERATURE GRADIENT TECHNIQUE

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【作者】 沈永宏彭增辉关树海段安锋王琦

【Author】 SHEN Yonghong~(1,2) PENG Zenghui~1 GUAN Shuhai~1 DUAN Anfeng~1 WANG Qi~1 (1.Changchun Institute of Optics Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130031; 2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)

【机构】 中国科学院长春光学精密机械与物理研究所

【摘要】 对现有的晶体生长温梯法进行改进,将炉内温场分为坩埚底部温度高于坩埚顶部温度的化料区和坩埚底部温度低于坩埚项部温度的温梯生长区两部分。通过对坩埚相对于温场位置的控制,获得适宜进行熔体均一化和晶体生长条件。生长了尺寸φ135mm×150mm 氟化钙(CaF2)晶体,生长的 CaF2晶体质量较好.位错密度<30/mm2,从190hm 到9000hm 透过良好,紫外200hm 处和红外9μm 处透过率可达80%以上。

【Abstract】 The temperature gradient technique(TGT)for crystal growth was improved.The temperature field in a furnace was di- vided into two zone:in the melting zone,the temperature of the crucible’s bottom is higher than the crucible’s top;conversely,in the temperature gradient growth zone,the temperature of the crucible’s bottom is lower than the crucible’s top,similar to traditional TGT. Controlling the relative position of the crucible according to the temperature field causes the melt to become homogenous and pro- vides good crystal growth conditions.Calcium fluoride (CaF2)crystals with a size of φ135 mm×150 mm having higher quality grown by the improved TGT.The dislocation density in CaF2 crystal is lower than 330/cm2.The crystal has a good transmissivity from 190 to 9000 nm.In the ultraviolet band,the transmissivity of the crystal is above 80 % at 200 nm,and above 80 % at infrared band 9 μm also.

  • 【会议录名称】 《硅酸盐学报》创刊50周年暨中国硅酸盐学会2007年学术年会论文集(一)
  • 【会议名称】《硅酸盐学报》创刊50周年暨中国硅酸盐学会2007年学术年会
  • 【会议时间】2007-08
  • 【会议地点】中国北京
  • 【分类号】O782
  • 【主办单位】中国硅酸盐学会
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