铒镱共掺钆镓石榴石激光晶体生长及荧光光谱分析

GROWTH AND FLUORESCENCE SPECTRAL ANALYSIS OF Er^(3+):Yb^(3+):Gd_3Ga_5O_(12) LASER CRYSTAL

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。

Er3＋：Yb3＋：Gd3Ga5O12（Er：Yb：GGG） series crystals were grown by Czochralski method doped with 3% （in mole, the same below）, 5% and 10% Er3＋ and 10% Yb3＋, respectively. The structure and fluorescence spectra of the Er,Yb：GGG crystals were analyzed. The results show that the as-grown crystals belong to cubic crystal system with Ia3d space group. In the fluorescence spectra of these crystal samples emitted by 980 nm laser, three strong emission peaks were shown at 1 030, 1 471 and 1 534 nm. With the increase of Er3＋ doping content, the intensity of the emission peak at 1 030 nm decreases gradually, while the intensity of the emission peaks at 1 471 and 1 534 nm enhance gradually due to the sensitization effect of Yb3＋ to Er3＋ ions. The stimulated emission cross section of each peak was calculated. The stimulated emission cross section of the crystal sample doped with 10% Er3＋ and 10%Yb3＋ （10%Er： 10%Yb：GGG） is up to 2.007 3 × 10–18 cm2, which can emit much stronger laser at 1 534 nm within the safety range for human eyes.