Glass‐forming region and enhanced Bi NIR emission in sodium tantalum silicate laser glass
Glass‐forming region and enhanced Bi NIR emission in sodium tantalum silicate laser glass
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DOI：
10.1111/jace.16121
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发表时间：
2018-10
影响因子：
3.9
通讯作者：
Jiemin Peng;Jiangkun Cao;Linling Tan;M. Peng
中科院分区：
文献类型：
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作者：
Jiemin Peng;Jiangkun Cao;Linling Tan;M. Peng
掺铋（Bi）玻璃和光纤由于其800 - 1700 nm近红外（NIR）发射而作为新型光纤激光器和放大器的有前途的活性介质受到关注。然而，二氧化硅中的光学活性Bi中心在高温光纤拉制期间容易挥发，这导致低Bi掺杂浓度和低增益NIR发光。在此，我们探索了硅酸钠钽（Na 2 O-Ta 2 O 5-SiO2）玻璃模型玻璃系统中的玻璃形成区域，并获得了用于增强Bi NIR发射的合适玻璃基质，随后详细分析了光学和结构表征。玻璃形成区域大致位于Ta 2 O 5 ≤ 30摩尔%、SiO2≥ 40摩尔%和Na 2 O ≤ 40摩尔%的区域。通过将Ta引入玻璃网络中，不仅玻璃形成能力得到改善，而且Bi NIR发射也得到增强（约60倍）。解离的Na阳离子被限制在Ta（高场强元素）旁边，使得Na阳离子对玻璃形成和Bi NIR发射的负面影响减弱，这是高度增强的Bi NIR发射的原因。这项工作有助于我们理解钽硅酸盐玻璃系统的玻璃形成和Bi的发光行为。希望能为今后设计具有稳定发光性能的掺铋激光玻璃和高增益光纤提供参考。
Bismuth (Bi)‐doped glasses and fibers are of current interest as promising active media for new fiber lasers and amplifiers due to their 800‐1700 nm near‐infrared (NIR) emission. However, the optically active Bi centers in silica are easily volatilized during high‐temperature fiber drawing, which results in low Bi doping concentration and low gain NIR luminescence. Here, we explored the glass‐forming region in a model glass system of sodium tantalum silicate (Na2O‐Ta2O5‐SiO2) glass and attained suitable glass host for enhancing Bi NIR emission, right followed by detailed analysis on optical and structural characterization. Glass‐forming region roughly lies in where Ta2O5≤ 30 mol%, SiO2≥ 40 mol%, and Na2O ≤ 40 mol%. Not only is glass‐forming ability improved but also Bi NIR emission is enhanced (~60 times) by the introduction of Ta into glass network. Dissociated Na cations are restricted beside Ta, the high‐field‐strength element, so that the negative impacts of Na cations on glass formation and Bi NIR emission are weakened, which is responsible for the highly enhanced Bi NIR emission. This work helps us understand the glass‐forming of tantalum silicate glass systems and luminescent behaviors of Bi. Hopefully, it could contribute to designing the Bi‐doped laser glasses and high gain fibers with stable luminescent properties in future.