Abstract

The thermo-optic coupling model was established and used to simulate the thermal anisotropic property of AgGaS₂ crystal pumped by carbon dioxide laser at the wavelength of 9.6 um. To acquire the accurate results, the boundary conditions were established and the temperature anisotropy was approximated by an iterative method in this model. In the development process of the temperature distribution, the conversion efficiency of the harmonic beams was demonstrated and investigated under strong and weak cooling conditions. The results showed that a compensation of the phase mismatch caused by thermal effect can effectively improve the conversion efficiency of AgGaS₂ crystal better than the temperature control.

摘要

建立了热光耦合模型，用于模拟波长为9.6 um的二氧化碳激光泵浦的AgGaS ₂晶体的热各向异性特性。为了获得准确的结果，在该模型中建立了边界条件并通过迭代方法来近似温度各向异性。在温度分布的发展过程中，对强弱冷却条件下谐波光束的转换效率进行了论证和研究。结果表明，与温度控制相比，补偿热效应引起的相位失配可以有效提高AgGaS ₂晶体的转换效率。