Growth and spectral properties of Gd2SiO5 crystal codoped with Er and Yb

Gd2SiO5 (GSO) single crystal codoped with Yb3+ and Er3+ (Abbr. as Er:Yb:GSO) was successfully grown by the Czochralski (CZ) method for the first time and the spectral characteristics were investigated. The absorption and fluorescence spectra were measured. The emission lifetime of the I-4(13/2)-Er-level was measured to be 5.84ms and the emission cross-section at 1529nm was calculated to be 1.03 x 10(-20) cm(2). The results indicate that Er:Yb:GSO is a potential laser material at similar to 1. 55 mu m wavelength region. (c) 2006 Elsevier B.V. All rights reserved.

Co^2＋，Er^3＋：Y3Al5O12晶体的生长及其吸收特性

应用中频感应提拉法成功生长出新型的Co^2＋，Er^3＋：Y3Al5O12晶体。研究了室温下晶体的吸收光谱性能。结合Er^3＋：Y3Al5O12晶体的光谱，并利用调Q判据对Co^2＋，Er^3＋：Y3Al5O12晶体调Q特性进行了简单的分析。结果表明Co^2＋，Er^3＋：YAG晶体是一种很有潜力的白调Q激光晶体。

r面白宝石单晶的温梯法生长及缺陷研究

本文描述使用温梯法（TGT）生长（1-↑102）方向的白宝石单晶，应用X射线双晶摇摆曲线（XRC）测定了晶体内部的完整性，再利用KOH熔体腐蚀出样品的r面（1-↑102）上的位错蚀坑，借助扫描电子显微镜（SEM）进行观察，发现r面白宝石的位错腐蚀坑呈等腰三角形，并且有台阶状结构，并分析了位错的成因。

Er^3＋掺杂钨酸铅晶体的发光和光谱特征

本试验测试了Er^3＋掺杂钨酸铅晶体（PbWO4：Er^3＋）的吸收光谱，依据J-O理论，首次计算报道了光谱项特征：J-O强度参数、量子荧光效率、荧光分支比等，Ω2=3．75×10^-20cm^2，Ω4=0．67×10^-20cm^2，Ω6=0．41×10^-20cm^2。计算证实，PWO：Er^3＋中几乎有80％的激发能量非辐射跃迁转移致^4I13／2能级，^4I13／2的计算寿命是5200μs，J-O计算显示，在PWO中产生^4I13/2→^4I15/2和发射1．53μm．有高的几率。讨论了不同浓度E

Er^3＋／Yb^3＋共掺的氧化镧钇透明陶瓷的光谱性能研究

采用传统无压烧结工艺制备了Er^3＋／Yb^3＋共掺的氧化镧钇透明陶瓷并对其光谱性能进行了研究．样品具有较大的吸收和发射截面．La2O3的添加使样品的荧光寿命（τs）与玻璃接近，当Yb^3＋和Er^3＋的掺杂量分别为5at％和0．5at％时，测得τs=9．65ms．这种荧光寿命长、发射截面大和线宽窄的特性有利于微型、可集成化和大功率激光输出的实现．

导模法和温度梯度法生长r面蓝宝石(英文)

r面(0112)蓝宝石晶体可用作制备非极性GaN薄膜的衬底。采用温度梯度法(temperature gradient technique,TGT)和导模法(edge-defined film-fed crystal growth,EFG)生长了质量良好的r面蓝宝石晶体。利用双晶衍射、光学显微镜、光谱仪观察和分析了晶体的结构和缺陷。结果表明:TGT法生长的r蓝宝石晶体的双晶摇摆曲线对称性好,半高宽值仅为18 rad.s,位错密度为4×103 cm-2,透过率达83%,晶体质量好。与TGT法相比,EFG法生长的r面蓝宝石晶体的结构完整性较差,位错密度为5×105 cm-2,透过率仅为75%。但是EFG法具有晶体生长速度快,后期加工成本低的优点。

Growth and spectral properties of Er:Gd2SiO5 crystal

Er3+ -doped Gd2SiO5 (Er:GSO) single crystal with dimensions of circle divide 35 x 40 mm(3) has been grown by the Czochralski method. The absorption and fluorescence spectra of the Er:GSO crystal were measured at room temperature. The spectral parameters were calculated based on Judd-Ofelt theory, and the intensity parameters Omega(2), Omega(4) and Omega 6 are obtained to be 6.168 x 10(-20), 1.878 x 10(-20), and 1.255 x 10(-20) cm(2), respectively. The emission cross-section has been calculated by Fuechtbauer-Ladenbury formula. (c) 2007 Elsevier B.V. All rights reserved.