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采用提拉法生长了掺10%(摩尔分数,下同)Yb3+、掺Er3+分别为3%,5%和10%的Er3+:Yb3+:Gd3Ga5O12(Er:Yb:GGG)晶体。分析了Er:Yb:GGG晶体的结构和荧光光谱。结果表明:所生长的晶体属于立方晶系,Ia3d空间群。在980nm激光激发下,晶体样品在1000～1600nm范围内存在3个较强的发射带,相应的发射峰分别位于1030,1471nm和1534nm附近。由于Yb3+对Er3+的敏化作用,随着Er3+掺量的递增,1030nm处的发射峰强度逐渐减弱,1471nm和1534nm处的发射峰强度逐渐增强。计算了各个发射峰的受激发射截面积,铒和镱离子掺量为10%的晶体(10%Er:10%Yb:GGG)的受激发射截面高达2.0073×10–18cm2,可以产生较强的1534nm人眼安全波段的激光。
The Er3 +: Yb3 +: Gd3Ga5O12 (Er: Yb: GGG) crystals doped with 10% (molar fraction) Yb3 +, 3%, 5% and 10% Er3 + were grown by Czochralski method. The structure and fluorescence spectra of Er: Yb: GGG were analyzed. The results show that the grown crystals belong to the cubic system, Ia3d space group. Under 980nm laser excitation, there are three strong emission bands in the range of 1000 ~ 1600nm, the corresponding emission peaks are located near 1030, 1471nm and 1534nm respectively. Due to the sensitization effect of Yb3 + to Er3 +, the intensity of the emission peak at 1030 nm gradually decreases with the increase of the content of Er3 +, and the intensity of the emission peak at 1471 nm and 1534 nm gradually increases. The stimulated emission cross-sectional area of each emission peak was calculated. The stimulated emission cross-section (10% Er: 10% Yb: GGG) of crystal with erbium and ytterbium ion content of 10% was as high as 2.0073 × 10-18cm2, Of the 1534nm human eye safe band laser.