掺Yb^3硼磷酸盐玻璃物理和光谱性能研究

Investigation on physical and spectroscopic properties of Yb^3＋ doped borophosphate glasses

通过熔融法制得了一种新型掺Yb^3＋的（60-X）P2O5-xB2O3-40ZnO（x=5，10，15，20，25，30％（摩尔分数））系统激光玻璃，并分析了B2O3含量对玻璃结构、物理性能和光谱性能的影响。结果表明，随B2O3含量增加，玻璃由链状变为类似石英玻璃的三维网络结构，力学和热学性能逐步得到改善，并在20％（摩尔分数）B2O3时具有最佳值，当B2O3含量超过20％（摩尔分数）后，玻璃中[BO3]三角体含量开始增多，结构变得松散，力学和热学性能变差，当B203含量达到30％（摩尔分数）时玻璃发生了分相现象。随B2O3含量增加，积分吸收截面在3．77-4．11×10^4pm^3之间，受激发射截面在0．726-0．816pm^2之间，荧光寿命在0.903-0.965ms之间，增益系数在0．662-0.737pm^2．ms之间，最小泵浦强度在1．128-1．398kW／cm^2之间变化。这类硼磷酸玻璃有望成为高平均功率固体激光器的候选基质。

A series of Yb^3＋ doped （60-x） P2O5-xB2O3-40ZnO （x= 5,10,15,20,25,30mol%） system glasses were prepared by means of conventional melt-quench method and the influence of B2O3 content on structure, physical and spectroscopic properties were investigated. The results show that the link-like structure of glass converts into quartz-like network structure with increasing B2O3 content, accordingly, mechanical and thermal properties are improved, and the optimal values are obtained at 20mol% B2O3. The content of [BO3] increase and mechanical and thermal properties decrease when B2O3 content is larger than 20mol%, and phase separation appears at 30mol% B2O3. With the increase of B2O3 content, integral absorption cross-section is between 3.77 and 4.11×10^4pm^3, stimulated emission cross-section is between 0.726 and 0.816 pm^2, fluorescence time is between 0.903 and 0.965ms, gain coefficient is between 0.662 and 0.737 pm^2.ms, and the minimum pumping intensity is between 1.128 and 1.398kW/cm^2. This kind of borophosphate glasses could be the candidate to be used in high average power solid state lasers.