Abstract The investigation of the thermo-optic coupling process of AgGaSe2 crystal was carried out via pulsed CO2 laser during doubling frequency at wavelength of 9.6 µm. To further detecting the thermal anisotropic property of AgGaSe2, a thermo-optic coupling model of the nonlinear crystal under IR frequency was constructed, following the coupling process was simulated according to this model. The simulation results present the intensities of the fundamental and harmonic beams, transformation efficiency and temperature distributions during the evolution process in detail. At the same time, temperature distribution has been identified that influence the conversion efficiency and light intensity significantly. Consequently, data provide fruitful evidences that compensation for the phase mismatch induced by the thermal effect is an outstanding approach in recovering the reduction of conversion efficiency compared with the temperature control.

中文翻译：

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AgGaSe2晶体中红外倍频的热光耦合效应模拟

摘要 利用脉冲CO2激光在波长9.6 µm的倍频过程中研究了AgGaSe2晶体的热光耦合过程。为了进一步检测AgGaSe2的热各向异性特性，构建了红外频率下非线性晶体的热光耦合模型，并根据该模型模拟了耦合过程。仿真结果详细呈现了演化过程中基波和谐波光束的强度、转换效率和温度分布。同时，已经确定了对转换效率和光强度有显着影响的温度分布。最后，