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Temperature increase effects on a double-pass cavity type II second-harmonic generation: a model for depleted Gaussian continuous waves

机译：温度升高对双通腔II型二次谐波产生的影响：耗尽高斯连续波的模型

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In this work, the effect of temperature increase on the efficiency of a double-pass cavity type II second-harmonic generation (SHG) is investigated. To this end, a depleted wave model describing the continuous-wave SHG process with fundamental Gaussian waves was developed. First, six coupled equations were proposed to model a double-pass cavity to generate the second harmonic of a Gaussian fundamental wave in type II configuration. Then, the effect of temperature increase in the nonlinear crystal due to the optical absorption was modeled. To do this, a mismatched phase arising from changes in refractive indices was added to the coupled equations. Although the nondepleted assumption is usually used in such problems, a simultaneous solving of coupled equations with assumption of fundamental beam depletion was performed. The results were obtained by a homemade code written in Intel Fortran, and show how the efficiency of the SHG process decreases when the crystal is warmed up by 5, 10, and 15 K. Dramatic reductions in SHG efficiency were observed due to small changes in temperature. (C) 2015 Optical Society of America
机译：在这项工作中，研究了温度升高对II型二次通过腔二次谐波（SHG）效率的影响。为此，建立了描述基本高斯波的连续波SHG过程的耗尽波模型。首先，提出了六个耦合方程来模拟双通腔，以生成II型配置的高斯基波的二次谐波。然后，模拟了由于光吸收引起的非线性晶体中温度升高的影响。为此，将由折射率变化引起的失配相位添加到耦合方程中。尽管在此类问题中通常使用非耗尽假设，但同时进行了耦合方程的基本光束损耗假设的同时求解。结果是通过用Intel Fortran编写的自制代码获得的，结果显示了在将晶体预热5、10和15 K时，SHG效率如何降低。温度。 （C）2015年美国眼镜学会

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