Sc掺杂Nd:CaF_2激光晶体的结构及其光谱性能参数
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摘要
采用温度梯度法生长了0.5at%Nd、xat%Sc:CaF_2(x=0,2,5,8)系列晶体,测试了晶体的吸收光谱、荧光光谱和荧光寿命。研究发现发射强度和荧光寿命随着Sc~(3+)离子浓度的增加而提高。通过改变Sc~(3+)离子的浓度发现,当掺杂5at%Sc~(3+)时可以获得最大的吸收截面为1.42×10~(–20) cm~2。另外,掺入Sc~(3+)使共掺晶体在吸收光谱796 nm处产生新峰。综上,通过调节Sc~(3+)离子浓度,可以改变Nd~(3+)离子的局域结构,优化晶体的光谱性能。
0.5 at% Nd, xat% Sc:CaF_2 single crystals(x=0, 2, 5, 8) were fabricated via the temperature gradient technique in this work. The absorption spectra, fluorescence spectra and fluorescence lifetime of 0.5 at% Nd, xat% Sc:CaF_2 single crystals were investigated. Both fluorescence intensity and fluorescence lifetime were found to be enhanced with the increase of Sc~(3+) ion doping concentration. In addition, by optimizing the Sc~(3+) content, 0.5 at% Nd, 5 at% Sc:CaF_2 yielded the largest absorption cross section of 1.42′10~(–20) cm~2. Moreover, a new peak were observed at 796 nm with the Sc~(3+) ion doped in 0.5 at% Nd:CaF_2 crystals. Above all, the concentration of Sc~(3+) ion can regulate local structure of Nd~(3+) ion and optimize its crystalline spectral properties.
0.5 at% Nd, xat% Sc:CaF_2 single crystals(x=0, 2, 5, 8) were fabricated via the temperature gradient technique in this work. The absorption spectra, fluorescence spectra and fluorescence lifetime of 0.5 at% Nd, xat% Sc:CaF_2 single crystals were investigated. Both fluorescence intensity and fluorescence lifetime were found to be enhanced with the increase of Sc~(3+) ion doping concentration. In addition, by optimizing the Sc~(3+) content, 0.5 at% Nd, 5 at% Sc:CaF_2 yielded the largest absorption cross section of 1.42′10~(–20) cm~2. Moreover, a new peak were observed at 796 nm with the Sc~(3+) ion doped in 0.5 at% Nd:CaF_2 crystals. Above all, the concentration of Sc~(3+) ion can regulate local structure of Nd~(3+) ion and optimize its crystalline spectral properties.
引文
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[2]LUCCA A,JACQUEMET M,DRUON F,et al.High-power tunable diode-pumped Yb3+:Ca F2 laser.Optics Letters,2004,29(16):1879–1881.
[3]RICAUD S,DRUON F,PAPADOPOULOS D N,et al.Short-pulse and high-repetition-rate diode-pumped Yb:Ca F2 regenerative amplifier.Optics Letters,2010,35(14):2415–2417.
[4]KAMINSKII A A,OSICO V V,PROCHOROV A M,et al.Spectral investigation of the stimulated radiation of Nd3+,in Ca F2-YF3.Physics Letters,1966,22(4):419–421.
[5]KAMINSKII A A,ZHMURWA Z I,LOMONOV V A,et al.Two stimulated emission 4F3/2→4I11/2,13/2 channels of Nd3+ions in crystals of the Ca F2-Sc F3 system.Physica Status Solidi,1984,84(1):K81–K84.
[6]KAMINSKII A A,VERDúN H R.New crystal lasers utilizing disordered fluoride crystals activated with Nd3+ions pumped by semiconductor laser radiation.Soviet Journal of Quantum Electronics,1992,22(2):95–96.
[7]SOROKIN P P,STEVENSON M J.Stimulated infrared emission from trivalent uranium.Essentials of Lasers,1969,5(12):137–143.
[8]KAISER W,GARRETT C G B,WOOD D L.Fluorescence and optical maser effects in Ca F2:Sm3+.Phys.Rev.,1961,123(3):103–116.
[9]DANNECKER B,DéLEN X,WENTSCH K S,et al.Passively mode-locked Yb:Ca F2 thin-disk laser.Optics Express,2014,22(19):22278–22284.
[10]ABALLEA P,SUGANUMA A,DRUON F,et al.Laser performance of diode-pumped Yb:Ca F2 optical ceramics synthesized using an energy-efficient process.Optica,2015,2(4):288–291.
[11]QIN Z P,XIE G Q,MA J,et al.Generation of 103 fs mode-locked pulses by a gain linewidth-variable Nd,Y:Ca F2 disordered crystal.Optics Letters,2014,39(7):1737–1739.
[12]LI C,JIANG D,ZHANG F,et al.Continuous-wave and mode-locked operation of a diode-pumped Nd,La:Ca F2 laser.Optical Materials Express,2015,5(9):1972–1978.
[13]JIANG D,ZHAN Y,ZHANG Q,et al.Nd,Y:Ca F2 laser crystals:novel spectral properties and laser performance from a controlled local structure.Crystengcomm,2015,17(38):7398–7405.
[14]MA F K,ZHANG Q,JIANG D P,et al.Spectroscopic,dielectric properties and local structure observation by EXAFS for Nd,Y:Ca F2 crystal.Laser Physics,2014,24(10):105703–1–7.
[15]LIU J,LIU J F,SU L B,et al.Effects of Gd3+/Y3+codoping on the spectral properties of Nd:Ca F2 crystals.Acta Physica Sinica,2016,65(5):152–158.