中文摘要：

非线性KTP（KTiOPO4）晶体的各向异性导热性能对于部分消除热应力以改善倍频效果具有重要作用。建立了3ω法测试系统，介绍了其测量各向异性材料的原理。测试了SiO2薄膜／Si衬底试样的导热系数，验证了该实验方法及系统的合理性。应用此方法测试得到KTP晶体沿径向和倍频方向（轴向）的导热系数，得到其不均匀度为0．737。结果验证了KTP晶体导热系数的各向异性。设计的实验系统可以有效测量各向异性晶体的导热性能。

英文摘要：

It is important to evaluate the anisotropic thermal characteristics of nonlinear KTP crystal for improving the harmonic generation effect to reduce thermal stress produced by laser beam and the 3ω setup is developed. The thermal conductivity of SiO2 film on Si substrate is measured and the result shows that the system is valid. The thermal conductivities of KTP crystal in the harmonic generation and radial direction are determined using the 3ω technique. The results show a strong anisotropy of thermal conduction in the KTP crystal.