Er3+离子对Er3+/Tm3+共掺碲酸盐玻璃1.85μm波段光谱特性的影响

Effect of Er3+ concentration on the 1.85 μm fluorescence in Er3+/Tm3+ codoped tellurite glasses

采用高温熔融淬火技术制备了1.0 mol% Tm^3+离子和x mol% Er^3+离子(x=0,0.5,1.0和1.5 mol%)掺杂的系列碲酸盐玻璃,通过测量玻璃样品的差热扫描曲线(DSC)、X射线衍射(XRD)图和荧光光谱,对不同 Er^3+浓度下的玻璃物理性能和Tm3+离子荧光特性进行了研究。DSC结果显示,研制的稀土掺杂碲酸盐玻璃具有优异的热稳定性能,玻璃样品的析晶温度与转变温度之差大于130 ℃,而XRD图则证实了研制的玻璃样品具有非晶结构特征。在808 nm泵浦激励下,随着Er3+离子的引入,Tm^3+离子3F4→3H6能级间跃迁产生的1.85 μm波段荧光显著增强。当Er^3+离子掺杂浓度为1.0 mol%时,荧光强度提高了约76%,荧光强度的显著增强归因于Er^3+离子和Tm^3+离子之间的能量传递。然而,随着Er^3+离子掺杂浓度的继续增加,1.85 μm 波段荧光呈现出衰减现象,这归结于Er^3+离子浓度的淬灭效应。研究表明,具有合适浓度Er3+/Tm3+共掺碲酸盐玻璃是一种应用于1.85 μm波段固体激光器和光纤放大器的理想基质材料。

Er^3+/Tm^3+ codoped tellurite glasses with fixed amount of Tm^3+(1.0mol%) and variable amounts of Er^3+(0-1.5mol%) were prepared by melt-quenching technique and investigated by the differential scanning calorimeter (DSC),X-ray diffraction (XRD) and fluorescence spectra measurements.The DSC r esults reveal that the prepared glass samples possess good thermal stability with ΔT.(t he difference between the glass crystallization onset temperature and transition temperature) larger than 130℃ while the XRD patterns confirm the amorphous structural nature of glass system.Under the excitation of 808nm laser diode (L D),the 1.85μm band fluorescence of Tm^3+:3F4→3H6 transition increases si gnificantly with the introduction of Er3+,and an improvement by about 76% of fluorescence intensity was observed in the glass sample with 1.0mol% amo unt of Er^3+,which is attributed to the energy transfers between Er^3+ and Tm^3+ ions.However,with the further increase of Er^3+ concentration,a fluorescence decaying phenomenon,mainly resulting from the concentration quench ing effect of Er3+,occurred in the glass sample.The above results indicate that the prepared tellurite glass w ith appropriate codoped amounts of Er^3+/Tm^3+ ions is a promising host material applied for 1.85μm solid-state lasers and amplifiers.