Tm^(3+)掺杂SiO_2-Al_2O_3-PbF_2-AlF_3玻璃的光谱特性  

Spectral Properties of Tm^(3+)-Doped SiO_2-Al_2O_3-PbF_2-AlF_3 Glasses

作　　者：林琼斐[1] 夏海平[1] 王金浩[1] 张约品[1] 杨钢锋[2] 张勤远[2] 

机构地区：[1]宁波大学光电子功能材料重点实验室,浙江宁波315211 [2]华南理工大学光通信材料研究所特种功能材料教育部重点实验室,广东广州510640

出　　处：《光学学报》2008年第2期305-310,共6页Acta Optica Sinica

基　　金：浙江省自然科学基金(Y406220);宁波市博士基金(2005A610010,2005610023)资助课题

摘　　要：用高温熔融法制备了不同Tm3+摩尔分数掺杂的摩尔分数比为0.3(SiO2)…0.1(Al2O3)…0.1(AlF3)…0.5(PbF2)…x(Tm2O3)(摩尔分数x=0.5%,1.0%,2.0%,3.0%)玻璃。从吸收光谱特性出发,应用Judd-Ofelt理论,计算得到了Tm3+的J-O强度参量(Ω2,Ω4,Ω6)及Tm3+各激发能级的自发辐射跃迁概率、荧光分支比以及辐射寿命等光谱参量。在808nm波长的激光二极管激发下,研究了不同Tm3+掺杂摩尔分数下玻璃在约1.47μm与约1.8μm处的荧光特性,在掺杂摩尔分数约达到2.0%时,在1.8μm处的荧光强度达最大,然后随着掺杂摩尔分数的增大,其荧光强度反而降低。作者从Tm3+的交叉弛豫与摩尔分数猝灭效应解释了这一荧光强度变化的规律,同时,根据McCumber理论计算了Tm3+跃迁3H6→3F4的吸收截面和跃迁3F4→3H6的受激发射截面。Glasses with the compositions of 0.3SIO2-0.1A1203-0.1A1F3-0.5PbF2 doped with different Tm^3＋ concentration （x=0.5 mol%, 1.0 mol%, 2.0 mol% ,3.0 mol% ） were fabricated by conventional melting method. According to the absorption spectra and the Judd-Ofelt theory, the J-O strength parameters （Ω2 ,Ω4 ,Ω6 ） of Tm^3＋ were calculated, by which the radiative transition probabilities, fluorescence branching ratios and radiative lifetimes were obtained. The infrared emission spectra （with 808 nm laser diode excitation） at ~ 1.47 /~m and ~ 1.8/~m of various concentration Tm^3＋-doped glasses were studied. The emission intensity at 1.8 μm reaches to the maximum when the Tm^3＋-doping concentration is near to be 2.0 mol% and then decreases at higher concentration. The mechanism of the change of the fluorescence intensity was explained from the cross-relaxation effect and the concentration quenching effect of Tm^3＋. The absorption cross section of ^3 H6→^3 F4 transition and the stimulated emission cross section of ^3 F4→^3 H6 transition of Tm^3＋ have also been calculated according to McCumber theory.

关 键 词：光学材料 掺铥氟氧化物玻璃 光谱性质 交叉弛豫效应 

分 类 号：TQ171[化学工程—玻璃工业]