铒镱共掺钆镓石榴石激光晶体生长及荧光光谱分析

铒镱共掺钆镓石榴石激光晶体生长及荧光光谱分析

曾繁明，孙晶，张莹，黄德馨，张学建，王成伟，秦杰明，刘景和

(长春理工大学材料科学与工程学院，长春 130022)

摘要：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2.0073×10–18 cm2，可以产生较强的1534nm人眼安全波段的激光。

关键词：铒；镱；钆镓石榴石晶体；激光晶体；提拉法；荧光光谱

中图分类号：O782 文献标志码：A 文章编号：0454–5648(2010)05–0815–05

GROWTH AND FLUORESCENCE SPECTRAL ANALYSIS OF Er3+:Yb3+:Gd3Ga5O12 LASER CRYSTAL

ZENG Fanming，SUN Jing，ZHANG Ying，HUANG Dexin，ZHANG Xuejian，WANG Chengwei，QIN Jieming，LIU Jinghe (College of Material Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China) Abstract: 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 ana-lyzed. 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 980nm laser, three strong emission peaks were shown at 1030, 1471 and 1534nm. With the in-crease of Er3+ doping content, the intensity of the emission peak at 1030nm decreases gradually, while the intensity of the emission peaks at 1471 and 1534nm enhance gradually due to the sensitization effect of Yb3+ to Er3+ ions. The stimulated emission cross sec-tion 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 2.0073×10–18 cm2, which can emit much stronger laser at 1534nm within the safety range for human eyes.

Key words: erbium; ytterbium; gadolinium gallium garnet crystal; laser crystal; Czochralski method; fluorescence spectra

Er3+激活的激光材料在可见光和红外波段分别发射550nm(4S3/2→4S15/2)，1.54μm(4I13/2→4I15/2)和2.94μm(4I11/2→4I13/2)激光，其中1.54μm激光对人眼安全、操作方便，在激光医疗、激光测距、激光通信等领域有着广泛应用。[1–2]由于Er3+对激光二极管泵浦和灯泵浦的吸收较弱，激光阈值很高，以Yb3+为敏化离子，通过Yb3+和Er3+间的能量传递，可实现1.54μm人眼安全高效激光输出。

钆镓石榴石(Gd3Ga5O l2，GGG)，属于立方晶系，Ia3d(O h10)空间群，晶格常数a=1.2377nm。具有相均匀性宽、生长速度快、掺杂浓度高、荧光寿命长、机械强度高、热导率大、转换效率高等优点，是一种重要的固体激光基质材料。[3]由于GGG中Gd3+和Er3+，Yb3+半径比较接近，通过Er3+，Yb3+部分取代Gd3+格位，减少了离子半径失配，可实现高浓度掺杂，既降低了激光振荡阈值，又提高了激光输出效率。为此，实验采用提拉法生长出Er:Yb:GGG 激光晶体，并对其结构和光谱性能进行了研究。

1 实验

1.1 原料配比与多晶料制备

采用纯度为(99.999%，质量分数)的Er2O3，Yb2O3，Gd2O3，Ga2O3原料，按化学计量比进行配料，在自制的混料机上经过48h均匀混料。由于原

收稿日期：2009–09–20。修改稿收到日期：2009–11–05。

基金项目：教育部博士点基金(20060186003)；吉林省科技厅项目(20090525)资助项目。

第一作者：曾繁明(1976—)，男，博士，副教授。Received date:2009–09–20. Approved date: 2009–11–05.

First author: ZENG Fanming (1976–), male, Ph.D., associate professor. E-mail: zengfm@

第38卷第5期2010年5月

硅酸盐学报

JOURNAL OF THE CHINESE CERAMIC SOCIETY

Vol. 38，No. 5

M a y，2010