Improving the TEM00-mode laser efficiency is one of the main goals in solar laser research, motivated by the significant importance these high-quality beams hold for fields, such as materials processing. A seven-rod concept was designed to enhance the TEM00-mode solar laser efficiency through the adoption of Ce:Nd:YAG active media. Collection and concentration of solar rays were conducted by seven Fresnel lenses, assisted by six folding mirrors. The laser head was composed of seven aspheric lenses, a hexagonal window and seven grooved Ce:Nd:YAG rods, which were end-side-pumped. A total TEM00-mode laser power of 172.59 W was numerically achieved, corresponding to a 34.52 W / m2 collection efficiency and a 3.63% solar-to-laser power conversion efficiency. These efficiency values were 1.51 and 1.59 times higher than those from the previous numerical study that also involved the usage of a grooved Ce:Nd:YAG rod. A laser beam merging scheme is also presented, enabling the extraction of a single TEM00-mode laser beam from the seven rods. A TEM00-mode laser power of 207.55 W was attained, corresponding to collection and solar-to-laser power conversion efficiencies of 41.51 W / m2 and 4.37%, respectively.

中文翻译：

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七槽 Ce:Nd:YAG 棒太阳能激光泵浦方法，TEM00 模式收集效率为 34.5 W/m2

提高 TEM00 模式激光效率是太阳能激光研究的主要目标之一，其动机是这些高质量光束对材料加工等领域的重要性。七杆概念旨在通过采用 Ce:Nd:YAG 活性介质来提高 TEM00 模式太阳能激光效率。太阳光线的收集和集中是由七个菲涅耳透镜在六个折叠镜的辅助下进行的。激光头由七个非球面透镜、一个六角形窗口和七个端侧泵浦的凹槽Ce:Nd:YAG 棒组成。通过数值计算，TEM00 模式激光总功率为 172.59 W，对应于 34.52 W/m2 的收集效率和 3.63% 的太阳能到激光功率转换效率。这些效率值比之前也涉及使用凹槽 Ce:Nd:YAG 棒的数值研究的效率值高 1.51 和 1.59 倍。还提出了激光束合并方案，能够从七个棒中提取单个 TEM00 模式激光束。获得了 207.55 W 的 TEM00 模式激光功率，对应的收集效率和太阳能到激光功率转换效率分别为 41.51 W / m2 和 4.37%。