Tm^(3+)离子掺杂Ge-Ga-S-CsI硫卤玻璃近红外及中红外发光特性研究

Near- and Mid-Infrared Spectroscopic Properties of Tm^(3+)-Doped Ge-Ga-S-CsI Glasses

用熔融急冷法制备了系列不同Tm^(3+)离子掺杂浓度的Ge-Ga-S-CsI硫卤玻璃,测试了样品折射率、吸收光谱以及800 nm激光抽运下的近红外及中红外波段荧光光谱特性。用Judd-Ofelt理论计算分析了Tm^(3+)离子在Ge-Ga-S-CsI硫卤玻璃中的强度参数Ω_i(i=2,4,6),自发辐射跃迁几率A,荧光分支比β和辐射寿命r_(rad)等光谱参数。讨论了800 nm激光抽运下的样品近红外及中红外荧光特性与Tm^(3+)离子掺杂浓度之间的关系,并用McCumber(MC)理论和Futchbauer-Ladenburg(FL)公式分别计算了1.8μm和3.8μm处的受激发射截面。

Tm^3＋ -doped chalcogenide glasses in Ge-Ga-S-CsI system were prepared and the properties of glasses including density, absorption spectrum, emission spectra and fluorescence life in the near- and mid-infrared spectral region under 800 nm excitation were measured. The optical parameters such as intensity parameter Ωi （ i = 2,4,6）, predicted spontaneous A, radiative transition rate fl and lifetime rnd of Tm^3＋ in Ge-Ga-S-CsI glasses and so on by means of Judd-Ofelt theory according to absorption spectrum were calculated. The fluorescence spectra were investigated with the different Tm^3＋ ion concentration under 800 nm excitation. Also, the emission cross-section at 1.8 μm and 3.8 μm was found using the theory of McCumber and the Futchbauer- Ladenburg equation respectively.