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设计了一种阈值较低的太阳光直接抽运的Nd∶YAG固体激光器,采用有效面积为1.03m2、焦距为1.2 m的菲涅耳透镜为第1级太阳光会聚装置,分腔水冷型镀金锥形腔为第2级太阳光会聚装置。在液体导光透镜和镀金锥形腔的共同作用下,通过端面、侧面同时抽运直径为5 mm、长度为75 mm的Nd∶YAG螺纹晶体棒,获得了连续稳定的1064nm激光输出。利用光学设计软件ZEMAX和激光谐振腔仿真软件LASCAD建立理论模型,通过数值模拟验证实验结果并优化系统设计。该太阳光抽运Nd∶YAG固体激光器的激光输出功率最高为31.5 W,收集效率为30.58 W/m2,激光器阈值功率为102 W,斜率效率为4.25%,太阳光到激光的能量转换效率为3.2%。
A Nd:YAG solid-state laser with a lower threshold direct pumping is designed. The Fresnel lens with effective area of 1.03m 2 and focal length of 1.2 m is used as the first-stage sunlight condensing device. Cone cavity for the second level of solar convergence device. A continuous and stable 1064nm laser output was obtained by pumping Nd: YAG crystal rods with a diameter of 5 mm and a length of 75 mm through the end surface and the side surfaces simultaneously under the action of a liquid guiding lens and a gold-plated conical cavity. Using optical design software ZEMAX and laser cavity simulation software LASCAD to establish the theoretical model, verify the experimental results through numerical simulation and optimize the system design. The solar pumped Nd: YAG solid laser has the highest laser output power of 31.5 W, the collection efficiency of 30.58 W / m2, the laser threshold power of 102 W, the slope efficiency of 4.25% and the solar-to-laser energy conversion efficiency of 3.2 %.