In:Yb:Nd:LiNbO_3晶体的生长和光谱性能
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摘要
采用提拉法生长了0.4%(摩尔分数)Yb_2O_3,0.4%Nd_2O_3和(0.5%、1.0%、2.0%)In_2O_3的3种同成分In:Yb:Nd:LiNbO_3晶体。测试了掺杂晶体的紫外-可见吸收光谱和上转换发射光谱,探究了最优掺杂晶体的上转换发光强度与激发功率的关系。结果表明:随着In:Yb:Nd:LiNbO_3晶体中In3+浓度的增加,晶体的紫外吸收边分别位于349、340、和338 nm处。采用980 nm二极管激光器激发获得的上转换发射光谱表明,上转换绿光的发射光强度最强,其次为上转换红光的发射强度,中心波段分别位于562、726 nm处,对应于Nd3+的4G9/2→4I11/2跃迁及4G9/2→4I15/2跃迁。2%In:Yb:Nd:LN晶体上转换荧光发射性能最优。根据不同激发功率测试,Nd~(3+)的近红外发光属于单光子过程,上转换红光及上转换绿光发光属于双光子过程。
Three congruent LiNbO_3 single crystals doped with Yb2O3(0.4%, in mole fraction), Nd2O3(0.4%) and In2O3(0.5%、1.0%、2.0%) were grown by the Czochralski method. The ultraviolet-visible absorption spectra and up-conversion fluorescence emission spectra of In:Yb:Nd:LiNbO_3 crystals were measured. The relationship between up-conversion luminous intensity and excitation power of optimum doped crystals was investigated. The results show that the absorption edge positions of In:Yb:Nd:Li Nb O3 crystal are located at 349, 340 and 338 nm as In3+ ions concentration is increased. The up-conversion emission spectrum obtained by excitation with a 980 nm diode laser indicates that the green up-conversion emission center wavelength is located at 562 nm, which is corresponding to Nd3+ ions 4G9/2 → 4I11/2 transition, and In:Yb:Nd:LiNbO_3 crystal has the most intense luminous intensity. The red up-conversion emission center wavelength is located at 726 nm, which is corresponding to Nd3+ ions 4G9/2 → 4I15/2 transition. The optimum up-conversion fluorescence property of 2%In:Yb:Nd:Li Nb O3 crystal can be obtained. The results of different excitation power tests show that the near-infrared up-conversion fluorescence of Nd3+ ions is a single photon process, and the green up-conversion fluorescence and the red up-conversion fluorescence of Nd3+ ions both are a two-photon process.
Three congruent LiNbO_3 single crystals doped with Yb2O3(0.4%, in mole fraction), Nd2O3(0.4%) and In2O3(0.5%、1.0%、2.0%) were grown by the Czochralski method. The ultraviolet-visible absorption spectra and up-conversion fluorescence emission spectra of In:Yb:Nd:LiNbO_3 crystals were measured. The relationship between up-conversion luminous intensity and excitation power of optimum doped crystals was investigated. The results show that the absorption edge positions of In:Yb:Nd:Li Nb O3 crystal are located at 349, 340 and 338 nm as In3+ ions concentration is increased. The up-conversion emission spectrum obtained by excitation with a 980 nm diode laser indicates that the green up-conversion emission center wavelength is located at 562 nm, which is corresponding to Nd3+ ions 4G9/2 → 4I11/2 transition, and In:Yb:Nd:LiNbO_3 crystal has the most intense luminous intensity. The red up-conversion emission center wavelength is located at 726 nm, which is corresponding to Nd3+ ions 4G9/2 → 4I15/2 transition. The optimum up-conversion fluorescence property of 2%In:Yb:Nd:Li Nb O3 crystal can be obtained. The results of different excitation power tests show that the near-infrared up-conversion fluorescence of Nd3+ ions is a single photon process, and the green up-conversion fluorescence and the red up-conversion fluorescence of Nd3+ ions both are a two-photon process.
引文
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[2]DAI Li,LIU Chunrui,TAN Chao,et al.Optical properties of Mg2+,Yb3+,and Ho3+tri-doped LiNbO3 crystals[J].Chin Phys B,2017,26(4):04420.
[3]陈小兰,张耘,冉启义.掺铁铌酸锂晶体的光电导衰减特性研究[J].物理学报,2013,62(3):037201.CHEN Xiaolan,ZHANG Geng,RAN Qiyi.Acta Phys Sin(in Chinese),2013,62(3):037201.
[4]SUN Ting,LI Aihua,XU Chao,et al.Energy transfer properties of Nd3+-Yb3+in Nd:Yb:LiNbO3 crystals[J].Opt Laser Technol,2014,56:322-325.
[5]李晶莹,许士文.Mg:Nd:LiNbO3晶体生长及其光学性能研究[J].压电与声光,2004,26(1):52-55.LI Jingying,XU Shiwen.Piezoelectr Acoustoopt(in Chinese),2004,26(1):52-55.
[6]JAQUE D,CAPMANV J,SANZ GARCIA J A,et al.Nd3+ion based self frequency doubling solid state lasers[J].Opt Mater,1999,13:147-157.
[7]张国春,王国富,官向国,等.激光非线性复合功能晶体的研究和发展[J].无机材料学报,2001,16(5):769-778.ZHANG Guochun,WANG Guofu,GUAN Xiangguo,et al.J Inorg Mater(in Chinese),2001,16(5):769-778.
[8]商继芳,孙军,李清连,等.高重复频率铌酸锂电光调Q Nd:YVO4激光器(英文)[J].光子学报,2018,47(5):7-14.SHANG Jifang,SUN Jun,LI Qinglian,et al.Acta Photon Sin(in Chinese),2018,47(5):7-14.
[9]许晋瑞,张庆礼,彭方,等.Cr,Nd:GSAG晶体生长、光谱及LD泵浦激光性能研究[J].人工晶体学报,2017,46(9):1653-1659.XU Jinrui,ZHANG Qingli,PENG Fang,et al.J Synth Cryst(in Chinese),2017,46(9):1653-1659.
[10]WANG Yefu,LIU Gaoyuan,SUN Lingdong,et al.Nd3+-sensitized upconversion nanophosphors:Efficient in vivo bioimaging probes with minimized heating effect[J].ACS Nano,2013,7(8):7200-7206.
[11]张欣,代丽,冯国楠,等.镁掺量对镁钕铌酸锂晶体的抗光损伤和激光性能的影响[J].硅酸盐学报,2014,42(8):1078-1081.ZHANG Xin,DAI Li,FENG Guonan,et al.J Chin Ceram Soc,2014,42(8):1078-1081.
[12]苏卓琳,孟庆龙,于军立,等.掺氧化镁铌酸锂晶体的损伤阈值分析[J].光学学报,2015,35(11):234-241.SU Zhuolin,MENG Qinglong,YU Lijun,et al.Acta Opt Sin(in Chinese),2015,35(11):234-241.
[13]孔文杨,代丽,郝树伟,等.In:Yb:Er:LiNbO3晶体的生长和光谱性能[J].硅酸盐学报,2014,42(6):752-755.KONG Wenyang,DAI Li,HAO Shuwei,et al.J Chin Ceram Soc,2014,42(6):752-755.
[14]DAI Li,SU Yanqing,WU Shiping,et al.Effect of HfO2-codoping concentration on the optical properties of Er3+-doped LiNbO3[J].Modern Phys Lett B,2010,24:495-502.
[15]范叶霞,王义杰,李洪涛.氧化还原处理对Mg:Ce:Cu:LiNbO3晶体光折变性能的影响[J].硅酸盐学报,2009,37(5):832-836.FAN Yexia,WANG Yijie,LI Hongtao.J Chin Ceram Soc,2009,37(5):832-836.
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