【摘要】 利用X射线粉末衍射确定了Tm3+掺杂硅酸镓镧(La3Ga5SiO14,LGS)晶体的晶体结构;运用DICVOL91程序计算了该晶体不同部位的晶胞参数;测定了Tm:LGS晶体的室温吸收谱和470nm光激发下的发射光谱;根据Judd-Ofelt理论拟合了Tm3+的三个晶场调节参数Ωt(t=2,4,6),分别为2.694×10-20cm2,1.842×10-20cm2,0.030×10-20cm2;计算了各个能级跃迁的谱线强度、振子强度、吸收截面等,进而计算了3H4和3F4态的自发跃迁概率、辐射寿命、荧光分支比和积分发射截面,并对结果进行了分析.更多还原

【Abstract】 The structure of Tm 3+ -doped langasite（La₃Ga₅SiO 14 ,abbreviated as LGS） crystal has been measured by XRD. The crystal lattice parameters were calculated with DICVOL91 program. The absorption spectra and emission spectra （excitated under 470nm） of Tm:LGS single crystal was measured at room temperature. And the optical parameters, such as transition-line intensity, oscillator strength and absorption section were calculated by using Judd-Ofelt theory. The three intensity parameters Ω_t（t=2,4,6） were fitted to be 2.694×10 -20 cm²,1.842×10 -20 cm²,0.030×10 -20 cm²,respectively. The lifetime, branching ratio and integrated stimulated-emission cross section were obtained and the results were discussed.更多还原