测量了30%(原子分数)Er:YSGG晶体的晶胞参数:a=b=c=(1.24640±0.00065)nm,α=β=γ=90°。用Rietveld方法对X射线衍射谱进行了精修,给出了处于96h位置的O原子分数坐标(z,y,z)=(-0.031433±0.000780、0.058253±0.000792、0.155358±0.000776),并计算了氧配位多面体中的阴阳离子间距和夹角,结果表明Er^3+/Y^3+处于畸变十二面体的中心。另外还研究了该晶体在室温下的吸收光谱和荧光光谱的性质。在200-1700nm波段内,Er:YSGG晶体吸收谱带主要为Er^3+离子的特征吸收,计算了Er^3+在966、790nm处的吸收截面;测量了966、790和488nm为激发波长时的室温发射光谱,当激发波长为966nm时发射谱带强度较大。另外,以1534nm为监测波长得到室温下的激发光谱,研究结果表明Er:YSGG激光晶体适合于InGaAs二极管激光器的泵浦。
Lattice parameters of 30at% Er : YSGG single crystal were measured and it shows that a=b=c= (1. 24640d=0. 00065)nm,α=β=γ=90°. The XRD pattern was refined by Rietveld method. The fractional coordinates (x, y, z) of O atom located at 96h site are (-0.031433±0.000780, 0.058253±0. 000792, 0. 155358±0. 000776), the cation-anion distances and angles of the oxygen coordination polyhedron were also calculated. The results show that Er^3+/Y^3+ are located in the centre of a distorted coordination dodecahedron. Spectroscop- ic properties of the absorption spectra and fluorescence spectra of 30at% Er-doped YSGG crystal at room temperature were studied. It shows that the absorption at the range of 200-1700nm are mainly characteristic absorp- tion of Er^3+ and the absorption cross-section at 966nm and 790nm are 4.49×10^-21 , 9.93×10^-21 cm^2 respectively. The emission spectra excited by different excitation wavelengths were determined at room temperature. It shows that the intensity of the emission bands is stronger by 966nm. Additionally, the excitation spectrum with 1534nm as a monitoring wavelength was detected. The results show that Er : YSGG laser crystal could be pumped by a InGaAs LD laser.