太阳光抽运固体激光工作物质的研究

探讨了适合太阳光抽运的固体激光器工作物质的选择方法,并分析了几种备选工作物质的性质。用Matlab对太阳光谱的现有数据进行了三次样条插值运算,建立了太阳光谱的局部精细离散化模型,并结合红宝石、Nd∶YAG、Yb∶YAG、Nd∶YVO4、Cr∶Nd∶GSGG、掺Nd3 的光学陶瓷和掺Yb3 的石英光纤等激光介质的吸收光谱,进行了太阳光谱与激光介质吸收谱的匹配分析。得出各激光介质所吸收的能量占太阳常量的百分比分别为24.51%,15.98%,2.35%,6.46%,43.91%,15.98%,7.63%。并在一定假设条件下,计算了各介质的阈值抽运功率体密度。综合以上激光介质的材料热特性,选取对太阳光吸收较多,阈值低且热特性好的Nd∶YAG,掺Nd3 光学陶瓷,Cr∶Nd∶GSGG为较适合的太阳光抽运激光工作物质。

The Study of Active Medium for Solar-Pumped Solid-State Lasers

The properties of several solid active material for solar pumped lasers were studied. We used Matlab software to process solar spectrum with cubic spline interpolation. A local discrete model of solar spectrum was set up. With this model, we calculated the percentage of the solar energy which can be absorbed by different laser material such as Ruby, Nd∶YAG, Yb∶YAG, Nd∶YVO4, Cr∶Nd∶GSGG, Nd3+-doped glass ceramic and Yb3+-doped silica fiber are 24.51%, 15.98%, 2.35%, 6.46%, 43.91%, 15.98%, 7.63% respectively. Then in a assumed condition, we calculated the threshold of pumped power density of each active medium. Taking the thermal property of each medium into consideration, we chose Nd∶YAG, Nd3+-doped glass ceramic and Cr∶Nd∶GSGG as the most suitable medium with high couple efficiency, low threshold and good thermal property for solar-pumped solid state laser.