掺杂GSGG激光晶体热导率研究

Study on Thermal Conductivity of the Doped GSGG Laser Crystals

为研究不同掺杂GSGG激光晶体的导热特性，用瞬态脉冲法测量了273～393K温度范围内自己生长的Cr：GSGG、Nd，Cr：GSGG和Nd-GSGG激光晶体热导率。建立了实验样品温度场模型，推导出晶体热导率随温度升高呈下降变化趋势的结论，这与实验测量结果基本相符，通过对测量结果曲线拟合给出了拟合方程。并从理论上解释了掺入较高浓度的杂质Cr^3＋离子会使得晶体的热导率值有所降低，以及双掺Nd^3＋、Cr^3＋离子和单掺Nd^3＋离子的GSGG晶体热导率值基本相同的原因。

The thermal conductivity from 273K to 393K of Cr： GSGG,Nd, Cr： GSGG and Nd： GSGG laser crystals were measured by instantaneous measuring method. And the temperature field model of the experimental sample was established. It could deduce that the thermal conductivity of the laser crystals decline with the temperature increasing, which basically coincidence with the experimental results. The fitting equations was presented via fitted the curves. And the reasons why doped Cr^3＋ ions with high concentration could reduce the thermal conductivity of the laser crystals, the GSGG laser crystals codoped with Nd^3＋ ,Cr^3＋ ions and single doped with Nd3^＋ ions have the similar thermal conductivity were explained in theory.