Ghavami Sabouri Saeed, Khorsandi Alireza
Appl Opt. 2018 Oct 20;57(30):9140-9147. doi: 10.1364/AO.57.009140.
We report on the performance of an enhanced-cavity (EC) designed for obtaining high-power and efficiency second-harmonic generation (SHG). This is performed by numerical simulation of SHG coupled equations in the presence of a thermal dephasing effect that is effectively intensified through embedding the periodically poled LiNbO crystal by an oven-surrounded scheme. It is found that by setting the PPLN temperature at an optimum value, adjusting the mirror reflectively, and pumping power at certain values, gaining SHG efficiency of more than 90% is possible. We further realized that by an ECSHG device SHG efficiency can be improved by about 15%-50%. Moreover, compared to a single-pass SHG scheme, the EC-based SHG device is shown to be a very promising candidate to reduce and suppress the effect of thermal dephasing on the stability and efficiency of SHG radiation.
我们报告了一种为实现高功率和高效率二次谐波产生（SHG）而设计的增强腔（EC）的性能。这是通过对存在热退相效应的SHG耦合方程进行数值模拟来实现的，该热退相效应通过用烤箱包围方案嵌入周期性极化的LiNbO晶体而得到有效增强。结果发现，通过将周期性极化铌酸锂（PPLN）温度设置在最佳值，调整镜面反射率，并将泵浦功率设置在特定值，可以实现超过90%的SHG效率。我们进一步认识到，通过一个增强腔二次谐波产生（ECSHG）装置，SHG效率可以提高约15%-50%。此外，与单通SHG方案相比，基于EC的SHG装置被证明是一个非常有前途的候选方案，可减少和抑制热退相对SHG辐射的稳定性和效率的影响。
