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设计了太阳光直接抽运1064nm激光放大器,并实现了太阳光抽运下的激光放大。该激光放大器采用菲涅耳透镜和金属锥型腔相结合的太阳光会聚系统,增益介质为圆盘状Nd:YAG和Nd/Cr:YAG晶体。分析了固体激光放大的原理。通过tracePro仿真太阳光会聚系统,计算了增益介质表面的抽运光功率密度。基于Nd:YAG与Nd/Cr:YAG的光学与物理参数,用LASCAD仿真了增益介质内部的温度分布,验证了设计的可行性。在太阳辐射功率密度为900 W/m~2和种子光最大功率为300mW的实验条件下,最大激光输出为475.1mW。对比分析了不同的太阳光会聚系统和不同增益介质的放大实验数据,探讨了后续改进的方向。
The direct sunlight pumping 1064nm laser amplifier is designed and the laser amplification under the solar pumping is realized. The laser amplifier incorporates a sunlight converging system that combines a Fresnel lens with a metal conical cavity. The gain medium is a disc-shaped Nd: YAG and Nd / Cr: YAG crystal. The principle of solid laser amplification is analyzed. Through the simulation of sunlight convergence system by tracePro, the pumping light power density on the surface of gain medium was calculated. Based on the optical and physical parameters of Nd: YAG and Nd / Cr: YAG, the temperature distribution inside the gain medium was simulated by LASCAD, and the feasibility of the design was verified. The maximum laser output was 475.1 mW under the solar radiation power density of 900 W / m ~ 2 and the seed light maximum power of 300 mW. The experimental data of different sunlight convergence systems and different gain media are compared and analyzed, and the direction of subsequent improvement is discussed.