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太阳能是规模最大的可再生能源,为充分利用这一资源,太阳光直接抽运激光器是一种明智的选择。提出并搭建了采用两级会聚系统的太阳光抽运激光器系统。使用菲涅耳透镜作为大口径成像型第一级会聚系统,漫反射锥形聚光腔作为非成像型第二级会聚系统提高入射太阳光到工作物质的耦合效率。采用Nd:YAG晶体作为工作物质,获得了2.85 W的激光输出,从太阳光到激光的转换效率为0.43%。从菲涅耳透镜会聚效率、聚光腔内激光棒轴线上的功率分布等会聚系统方面和激光输出特性方面分析了该太阳光抽运激光器的性能;探讨了转换效率低的原因,并提出了相应的改进措施。
Solar energy is the largest renewable energy source. To make full use of this resource, direct sunlight pumping is a wise choice. A solar pumping laser system using two-level convergence system is proposed and constructed. The Fresnel lens is used as a first-order converging system for large-aperture imaging and the diffuse cone-shaped condensing cavity is used as a non-imaged second-order converging system to improve the coupling efficiency of incident sunlight to the working substance. The Nd: YAG crystal was used as the working substance and a laser output of 2.85 W was obtained. The conversion efficiency from sunlight to laser was 0.43%. The performance of the solar pumping laser was analyzed in terms of the converging efficiency of the Fresnel lens, the power distribution on the rod axis of the converging cavity, and the laser output characteristics. The reasons for the low conversion efficiency were discussed. Corresponding improvement measures.