大尺寸掺钛铝酸铍(Ti^(3+):BeAl_2O_4)激光晶体的提拉法生长  

Growth of large Ti^(3+):BeAl_2O_4 laser crystals by Czochralski method

作　　者：夏海平[1] 徐铁峰[1] 张新民[1] 王金浩[1] 章践立[1] 

机构地区：[1]宁波大学光电子功能材料重点实验室,浙江宁波315211

出　　处：《光学技术》2009年第2期307-309,共3页Optical Technique

基　　金：浙江省科技厅资助项目(2007C21121);宁波市科技局资助项目(2007B10053);宁波市重点实验室开放基金资助项目(2007A22010);中国科学院激发态物理重点实验室资助项目(2007004)

摘　　要：应用提拉法技术,采用BeO:Al2O3:Ti2O3摩尔比=100:99.85:0.15的化学组分配比,以及选用合适的固液界面温度梯度与生长速度等优化工艺条件,成功地生长出了T3+离子掺杂、无气泡、无云层和核心、尺寸≈Ф60mm×85mm的粉红色Ti3+:BeAl2O4大尺寸晶体。测定了Ti3+:BeAl2O4晶体的激发与荧光光谱。沿着晶体生长方向,晶体的颜色变深。在激发光谱中观测到了502 nm与567nm的激发峰,在发射光谱中观察到了发光中心为710nm的宽带荧光。两激发峰与Ti3+离子的2T2→2E能级跃迁有关,710nm的荧光峰是由振动能级2E→2T2产生的。从不同部位晶体的吸收强度和颜色变化可得到Ti3+离子在BeAl2O4晶体中的有效分凝系数小于1。The pink Ti^3＋ -doped BeAl2O4 crystals in the size of Ф60mm×85mm without bubble, cloud and cores is grown by Czochralski （CZ） technique under the technical conditions of choosing BeO：ml2O3：Ti2O3 raw chemical compositions in molar ratio of 100：99.85：0.15, using favorable temperature gradient of solid-liquid interface and growth rate. It is found that the pink color of the crystal becomes deeper along the growing direction. Two exciting bands peaked at 502 and 567nm, which are attributed to the electron transition of 2T2→2E level, and an abroad emission band peaked at 710 nm, which is assigned to the electron transition of 2E→2T2 levels, are observed in the excitation and emission spectra. From the absorption intensity and color change of the different parts of crystal, it can be deduced that the effective distribution coefficient of Ti^3＋ ion in BeAl2O4 crystal is less than 1.

关 键 词：光学材料 Ti^3+离子 铝酸铍晶体 提拉法 光谱 

分 类 号：TB381[一般工业技术—材料科学与工程]