We reviewed the tellurite glass purification studies performed over the last 20 years, in particular dealing with the mid‐infrared (mid‐IR) transmission performances. Best results are obtained under rich O₂ atmosphere with platinum crucibles although Gibbs energy calculations show that other crucibles material are possible such as gold or alumina. From the point of view of the thermodynamics of involved oxidation reactions only, we identified the suitable conditions based on Gibbs energy calculations to be a synthesis temperature set above 900 K and a O₂ pressure around 10⁵ Pa. The performances of the different purification techniques were also compared. Finally, we analyzed the tellurite fibers recently optimized for mid‐IR which present low attenuation up to 4 µm allowing supercontinuum generation up to 5 µm.

中文翻译：

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审查中红外光纤应用中的亚碲酸盐玻璃净化问题

我们回顾了过去20年中进行的碲酸盐玻璃净化研究，特别是关于中红外（mid-IR）传输性能的研究。尽管Gibbs能量计算表明，其他坩埚材料（例如金或氧化铝）也是可行的，但在富O ₂气氛下使用铂坩埚可获得最佳结果。仅从涉及的氧化反应的热力学角度来看，我们根据吉布斯能量计算确定了合适的条件，即合成温度设定为900 K以上，O ₂压力约为10 ⁵ Pa。还比较了不同纯化技术的性能。最后，我们分析了最近针对中红外优化的碲酸盐纤维，其衰减低至4 µm，可产生高达5 µm的超连续谱。