掺镱硅酸盐激光玻璃的制备与光谱特性分析

采用高温熔融工艺制备了两块组分差别不大的掺镱(Yb3+)硅酸盐激光玻璃.测试出两块玻璃样品的吸收光谱和荧光光谱;计算了Yb3+掺杂玻璃的积分吸收截面、受激发射截面、荧光线宽、能级寿命、最小粒子数、饱和泵浦强度、最小泵浦强度等参数,比较发现样品的吸收截面图与倒易法计算所得的受激发射截面图线型相似,而与F-L法计算所得的受激发射截面图筹别较大,这与理论分析相吻合.两块玻璃样品的吸收光谱的线型基本一致,吸收主峰位于975 nm,次峰位于908 nm,这就说明影响激光玻璃吸收光谱线型的主要因素足玻璃基质的组成.两块玻璃样晶的荧光光谱差别比较大,样品1主峰位于993 nm,次峰位于1 029 nm;样品2主峰位于1 035 nm,次峰位于994nm,差别原因主要在于Yb3+离子的掺杂浓度不同.

Investigation on the Fabrication and Spectrum Properties of yb3+-Doped Silicate Laser Glasses

Two kinds of Yb3+ doped silicate laser glass with little difference were produced by high temperature of melting process. The absorption and emission spectra of the two glass samples were tested by the correlative spectrographs; the integral absorption cross section, stimulated emission cross section, fluorescence line-width, fluorescence lifetime, least particle count, saturation pump intensity and least pump intensity of the Yb3+-doped laser glasses were calculated respectively, and by comparison it was found that the chart of the absorption cross section is similar to the stimulated emission cross section calculated by the reciprocity method, and is very different from the stimulated emission cross section calculated by the Fuchbauer-Ladenburger method. This result is precisely in line with the theoretical analysis. The line-types of the absorption spectra of the two glass samples are almost the same, and the first peak value of absorption is located at 975 nm while the second peak value is at 908 nm. As the two components of the samples are not very different, the accord of the line-types of the absorption spectra indicates that the makeup of the glass material is the primary factor influencing the line-type of the absorption spectra. The fluorescence spectra of the two glass samples are very different, and the first fluorescence peak value of sample one is located at 993 nm with the second peak value at 1 029 nm, while the first fluorescence peak value of sample two is located at 1 035 nm with the second peak value at 994 nm. The cause of the major difference in the fluorescence spectra of two samples lies in the different doping density of Yb3+. By comparison we found that the laser performance of sample two is better than that of sample one. The test shows that both samples are suitable for drawing fiber.