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首页> 外文期刊>Crystal growth & design >Polarized Micro-Raman Scattering of CaNb2O6 Single Crystal Fibers Obtained by Laser Heated Pedestal Growth
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Polarized Micro-Raman Scattering of CaNb2O6 Single Crystal Fibers Obtained by Laser Heated Pedestal Growth

机译：激光加热基座生长获得的CaNb2O6单晶纤维的偏振微拉曼散射

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摘要

Optically transparent single crystal fibers of calcium niobate (CaNb2O6) were investigated by polarized micro-Raman spectroscopy. The fibers were obtained by the laser heated pedestal growth technique, in the form of rods with about 0.4 min diameter and up to 20 mm long. The crystalline axes were determined by mid-infrared reflectivity and X-ray diffraction. The fibers grew within the Pbcn columbite structure, with their longitudinal axis parallel to the crystallographic a-axis. They were free of cracks or facets, and no secondary phases were detected by the spectroscopic or structural characterizations, Polarized Raman spectra were obtained in adequate parallel and crossed configurations for the orthorhombic D-2h point group. In short, a total of 48 Raman phonon modes, which are characteristic of the CaNb2O6 columbite crystal, were discerned, in good agreement with group theoretical predictions. The selection rules for the columbite group were generally well obeyed, confirming the high purity, ordering, and quality of the material. The knowledge of the optical phonon characteristics of the CaNb2O6 single crystals presented here is important to design compact optical devices, such as solid-state lasers operating in the near-infrared region.
机译：通过偏振微拉曼光谱研究了铌酸钙（CaNb2O6）的光学透明单晶纤维。纤维是通过激光加热的基座生长技术获得的，呈直径约0.4分钟，长至20 mm的棒状。晶轴通过中红外反射率和X射线衍射确定。纤维在Pbcn柱状结构中生长，其纵轴平行于晶体学a轴。它们没有裂纹或小面，并且通过光谱学或结构表征未检测到任何次级相。对于正交斜D-2h点组，在足够的平行和交叉构型下获得了偏振拉曼光谱。简而言之，可以辨别出总共48个拉曼声子模式，这些模式是CaNb2O6哥伦比晶体的特征，与群理论预测相吻合。哥伦比组的选择规则通常得到了很好的遵守，从而确认了材料的高纯度，有序性和质量。此处介绍的CaNb2O6单晶的光声子特性知识对于设计紧凑的光学器件（例如在近红外区域工作的固态激光器）非常重要。

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