钨酸钇钠晶体中Tm^(3+)的光谱特性

Spectroscopic properties of Tm^(3+)-doped NaY(WO_(4))_(2) crystals~*

测量了Tm3+ :NaY(WO4 ) 2 晶体的吸收光谱、发射光谱和激发光谱 ,利用J_O理论计算了钨酸钇钠晶体的强度参数 :Ω2 =7 2 130 4× 10 - 2 0 cm2 ,Ω4 =0 5 0 4 76 6× 10 - 2 0 cm2 ,Ω6 =0 977784× 10 - 2 0 cm2 ,以及Tm3+ 的光学参数包括各能级的荧光寿命和荧光分支比、积分发射截面等 ,在计算了Tm3+ 的自发辐射概率时 ,同时考虑了电偶极跃迁和磁偶极跃迁 .研究了其发光特性和跃迁通道 ,发现存在1 D2 +3H6 →1 G4 +3F4

Absorption spectra, emission spectra and excitation spectra of Tm^(3+)_doped NaY(WO_(4))_(2) crystals have been measured at room temperature. Such parameters as the intensity parameter, oscillation strength, rate of spontaneous emissions, lifetime and integrated emission cross section have been calculated according to Judd_Ofelt theory and absorption spectra. The intensity parameters are Ω_(2)=8.67319×10^(-20)cm^(2),Ω_(4)=1.70424×10^(-20) cm^(2),Ω_(6)=1.55845×10^(-20) cm^(2 ). When calculating the spontaneous emission lifetimes, we take into account the magnetic dipole transitions. From the measured spectra, the mechanism of transitions has been analyzed in detail and the cross relaxation ()^(1)D_(2)+()^(3)H_(6)→^(1)G_(4)+()^(3)F_(4) were put forward and verified.