The Preparation And ～2.0μm Spectral Properties Of Rare-Earth Doping Tellurite Glass

In recent years, tellurite glass have been extensively studied due to its widely applications in imaging, laser, energy transfer et al. Compared with other materials, tellurtie glass has lower phonon energy, better physical and chemical properties, affordable eco-friendly and excellent mid-infrared optical performance, which make its to a potential candidate materials for mid-infared lasers. Up to now the concentration of OH^-, multi-phonon relaxation rate and the energy transfer between rare earth ions are the main factors that affect the mid-infrared fluorescence properties of tellurite glass. In this work, systematic study of different dehydration method has been done based on the traditional compositions of tellurite glass. And, by heat treatment method and codoping Nd³⁺, glasses with better optical properties are made.The main contents and research results are asfollows:1. In this work, three types of dehydration gases are employed for the fabrication of tellurite glasses with low OH content（TWL2, TWL3,TWL4, TZB2, TZB3, TZB4）. Also glasses without dehydration（TWL1,TZB1） are made as comparisons. By bubbling with dry oxygen and CCl₄ gas in TWL glasses, the content of OH groups are about 0.68×1019ions/cm3. The strong 2.7μm emission can be obtained from the TWL glasses with low OH content, and the â–³T of the TWL glass is very large which is beneficial for fiber drawing. While by bubbling with dry oxygen and 1mol% NH₄HF₂, the content of OH groups were about 1.25×1019ions/cm3 in TZB glass. The phonon energy of TZB glass is lower than that of TZB glass which makes TZB glass very suitable for bulk laser gain medium.2. To improve the mechanical properties, thermal conductivity and the mid-infrared emission of tellurite glass, tellruite glasses doped with Tm³⁺ are heat-treated by the temperature of 340℃ and 390℃ based on the DSC test of the glass. Crystals of Na₂Te₅O₁₈ were observed in the glass after the heat-treatment. The emission of Tm³⁺ is stronger in the glass-ceramics than that of those without heat-treatment.3. To further improve the mid-infrared emission of tellurite glass, tellurite glasses co-doped with Tm³⁺/Nd³⁺ are made. The strong 2.1μm emission can be obtained from the tellurite glasses co-doped with Tm³⁺/Nd³⁺. After the heat-treatment, the 2.1μm emission shows large enhancement...