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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 selection method of working substance suitable for solar pumping is discussed, and the properties of several alternative working substances are analyzed. By using Matlab, the cubic spline interpolation is performed on the existing data of the solar spectrum, and a local fine discretization model of the solar spectrum is established. Combined with ruby, Nd:YAG, Yb:YAG, Nd:YVO4, Cr:Nd:GSGG, Nd3 + -doped optical ceramics and Yb3 + -doped silica fibers were used to analyze the absorption spectra of the solar media and laser media. It is found that the percentages of energy absorbed by each laser medium accounting for solar constant are 24.51%, 15.98%, 2.35%, 6.46%, 43.91%, 15.98% and 7.63% respectively. Under certain assumptions, the threshold pumping power density of each medium was calculated. Based on the above thermal properties of the laser medium, Nd: YAG, Nd3 + -doped ceramics and Cr: Nd: GSGG are selected as the most suitable solar pumping laser materials for solar energy absorption, low threshold and good thermal properties.