We report the results of a theoretical study of the combined end-side pumped solar lasers to solve the problem associated with a recent experimental finding where the unexpected underperformance of the Ce doped Nd:YAG lasers in comparison to pure Nd:YAG lasers was observed. For this, we have developed a theoretical model based on space-dependent rate equations, which considers the effect of the thermal population of the laser levels on the laser output. It is shown that the main reason for the lower laser performance of recently experimentally realized Ce:Nd:YAG solar laser in the end-pumped regime and the fracture of the Ce:Nd:YAG rod at the process is the excessively high thermal load on the end of the laser rod. As a result of our study, we propose easily-feasible solutions based on optimal pumping and cooling configurations. The results of this study also demonstrate that under the necessary conditions, using Ce:Nd:YAG as an alternative to Nd:YAG in the combined end-side pumping configuration could increase the laser output by more than 1.5 times.

中文翻译：

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较低激光能级的热粒子数对端侧泵浦 Ce:Nd:YAG 太阳激光器性能的影响

我们报告了组合端侧泵浦太阳激光器的理论研究结果，以解决与最近实验发现相关的问题，其中观察到 Ce 掺杂 Nd:YAG 激光器与纯 Nd:YAG 激光器相比性能出乎意料的低下。为此，我们开发了一个基于空间相关速率方程的理论模型，该模型考虑了激光能级的热粒子数对激光输出的影响。结果表明，最近实验实现的Ce:Nd:YAG太阳能激光器在端面泵浦状态下的激光性能较低，Ce:Nd:YAG棒在过程中断裂的主要原因是过高的热负荷激光棒的末端。作为我们研究的结果，我们提出了基于最佳泵送和冷却配置的简单可行的解决方案。