Tm^(3+)-Yb^(3+)共掺杂的碲酸盐玻璃和光纤的光谱特性

Spectroscopic Properties of Tm^(3+)-Yb^(3+)-codoped Tellurite Glasses and Fibres

研究了Tm3+-Yb3+共掺杂的碲酸盐玻璃和光纤在980nm激光二极管激发下的可见与近红外光谱性质。室温下,Tm3+-Yb3+共掺杂的碲酸盐玻璃在480,800nm处观测到了很强的上转换发光,在650nm观测到一较弱的上转换发光,它们分别来自Tm3+离子的1G4→3H6,3H4→3H6和1G4→3F4跃迁;在1020,1810nm处观测到近红外发射,它们分别属于Yb3+离子的2F5/2→2F7/2跃迁和Tm3+离子的3F4→3H6跃迁。研究了其发光特性与Tm3+及Yb3+的浓度的依赖关系。此外,在980nm激光激发下,还观测到Tm3+-Yb3+共掺杂的碲酸盐玻璃光纤在1060,1470,1910nm附近的近红外发射。详细讨论了其发光机制,该材料可望用于制作蓝色上转换光纤激光器、S-波段光纤放大器以及在医疗诊断和遥感中有着广泛的应用的1.9μm光纤激光器。

Upconversion Tm^3＋ -doped fibre lasers have recently attracted much interest as compact and efficient blue light source. A CW room temperature upconversion laser at 480 nm has been demonstrated. Since the high power laser with several hundreds milliwatts to several watts power at 980 tim is commercially available and Yb^3＋ ion has a large absorption cross-section around 980 nm, the Tm^3 ＋ , Ho^3 ＋ , Er^3 ＋ , and Pr^3 ＋ ions have successively been excited via the energy-transfer processes in different host by exploiting the Yb^3＋ ions as sensitizers for the upconversion processes. On the other hand, the transition 3^F4→3^H6 of Tm^3 ＋ at 1.8 μm has applications in medicine and remote sensing, and consequently it has attracted a lot attention recently. In this paper, the visible and near infrared spectroscopic properties of Tm^3 ＋ -Yb^3 ＋ -codoped tellurite glasses and fibres under the excitation of a 980 nm laser diode were investigated nm, and weak emission at 650 respectively, were recorded in nm, attributed to 1^G4→3^ H6, and 1^ G4→3^F4 transitions of Tm^3＋ ,respectively, were recorded in Tm^3＋ -Yb^3＋ -codoped tellurite glasses at room temperature. The near infrared emissions at 1 020 and 1 810 nm, which were attributed to transitions Yb^3＋ ：2F5/2→2^F7/2 and Tm^3＋ ：3^F4→3^H6,respectively, were also observed. The emission characteristics dependence on Tm^3 ＋ and Yb^3＋ ions concentrations was also studied. In addition, intense upconversion emissions at 495 and 830 nm, and weak emission at 650, and near infrared emissions at 1 060, 1 470 and - 1 910 nm were recorded in Tm^3＋ -Yb^3＋ -codoped tellurite fibres using 980 nm laser excitation. The luminescence mechanisms are discussed in detail for designing upconverted blue fibre laser, S-band fibre amplifier, and 1.9μm fibre laser for their potential application in clinical diagnosis and remote sensing.