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引用次数: 10
摘要
给出了纯铌酸锂单晶和掺杂铌酸锂单晶热扩散系数的测量结果。参考样品为纯晶体。其余分别掺杂:Cu (0.05%at.)， Dy (0.1% at.)。,在1.0%。， 1.7%at.)， Er + Yb (1.0%at.)。Er + 1.0%at。Yb)离子。在[100]，[120]和[001]晶体学方向上测定了热性能。采用基于海市蜃楼效应的光热方法进行了实验研究。该方法基于测定热波在被测样品中传播时的相位滞后。所得结果表明，纯晶体和掺杂样品的热扩散系数具有明显的各向异性。在[001]方向(c轴)的热性能高于垂直于它的方向。出乎意料的是，在平面(001)上也观察到了热扩散系数的各向异性。
Photothermal measurement with mirage effect for investigation of LiNbO3 single crystals
Results of measurements of the thermal diffusivity of pure and doped lithium niobate single crystals are presented. A reference sample was a pure crystal. The others were doped with: Cu (0.05%at.), Dy (0.1 %at., 1.0%at., and 1.7%at.), and Er + Yb (1.0%at. Er + 1.0%at. Yb) ions. Thermal properties were determined in [100], [120] and [001] crystallographic directions. Experimental studies were carried out using photothermal method based on mirage effect. This method based on determination of a phase lag connected with propagation ofa thermal wave in investigated sample. Obtained results showed considerable anisotropy of the thermal diffusivity of pure crystal and doped samples. The thermal properties in [001] direction (c-axis) is higher than in directions perpendicular to it. Unexpectedly, anisotropy of the thermal diffusivity in plane (001) was also observed.
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