高浓度铒离子掺杂钨酸镱钾激光晶体上转换发光研究(英文)  

Up-conversion luminescence of highly Er^(3+)-doped potassium ytterbium tungstate laser crystal

作　　者：张莹[1] 刘景和[2] 李春[2] 林海[2] 曾繁明[2] Mauro Tonelli 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]长春理工大学材料科学与工程学院,吉林长春130022 [3]意大利比萨大学,比萨56127

出　　处：《红外与激光工程》2012年第9期2322-2327,共6页Infrared and Laser Engineering

基　　金：吉林省教育厅计划项目(2009JYT15);吉林省科技厅计划项目(20090709);长春市科技局计划项目(2009110)

摘　　要：首次采用泡生法生长了掺铒钨酸镱钾(分子式:Er3+:KYb(WO4)2,简称:Er:KYbW)激光晶体。室温下测试了该晶体的吸收及上转换发射光谱。在荧光光谱中,观察到3个较为明显的上转换发射带,分别位于470~560nm,645~675 nm,750~850 nm。其中,位于533 nm处的上转换绿光强度最大。基于能量匹配原理分析了晶体上转换发光基质,结果表明,上转换红光和绿光的发光渠道均为双光子过程。根据J-O理论,计算了光谱参数,强度参数为:Ω2=16.342×10-20cm2,Ω4=4.183×10-20cm2,Ω6=1.264×10-20cm2;对应于绿光4S3/2-4I15/2跃迁的荧光分支比为76.37%,荧光寿命为278μs。这些光学参数表明Er:KYbW激光晶体可实现高效上转换绿光发射。A highly Er3＋-doped（10 at.%） potassium ytterbium tungstate（Er3＋：KYb（WO4）2,hereafter Er：KYbW） laser crystal was grown by the Kyropoulos method for the first time.The absorption and up-conversion emission spectra of Er：KYbW laser crystal were investigated at room temperature.Three obvious up-conversion emission bands were observed at the regions of 470-560,645-675,750-850 nm,and green up-conversion emission at 533 nm was much stronger.The mechanism of up-conversion emissions was discussed based on energy-matching principle.It was confirmed that two-photon process was involved in green and red up-conversion emissions.Based on Judd-Ofelt theory,the intensity parameters Ωλ（λ=2,4,6） were： Ω2=16.342×10-20 cm2,Ω4=4.183×10-20 cm2,Ω6=1.264×10-20 cm2.The calculated green up-conversion fluorescence branching ratios for 4S3/2-4I15/2 transition was 76.37%,and the radiative lifetime was 278 μs.These optical parameters indicate that Er：KYbW is a highly efficient solid-state laser crystal for green up-conversion emission.

关 键 词：掺铒钨酸镱钾 激光晶体 上转换发光 光谱参数 

分 类 号：O78[理学—晶体学]