【摘要】 以K2W2O7作为助熔剂,Yb3+为敏化剂,采用泡生法生长掺8%(摩尔分数,下同)Tm3+和1%Ho3+的Tm,Ho:KYb(WO4)2(Tm,Ho:KYbW)晶体。采用X射线衍射(X-ray diffraction,XRD)分析了晶体的结构;测试了晶体的红外光谱和Raman光谱,并对出现的峰值进行了振动归属;测量了晶体的吸收光谱和荧光光谱,计算了相应的光谱参数。XRD分析表明:生长的晶体为单斜晶系的β型Tm,Ho:KYbW,C2/c空间群。在吸收光谱中,Yb3+在929、962 nm和1 000 nm处吸收峰最强,半峰宽为103 nm。荧光光谱中,在2 048 nm和1 626 nm附近有较强的发射峰,主峰2 048 nm处的发射线宽达132 nm,因此,Tm,Ho:KYbW晶体可作为可调谐激光增益介质。晶体的上转换荧光谱表明:在467 nm和782 nm处分别得到上转换蓝光和近红外光,确认了Tm3+和Ho3+之间存在交叉弛豫现象,并分析相应的上转换机制。更多还原

【Abstract】 The potassium ytterbium tungstate [Tm,Ho:KYb(WO4)2,Tm,Ho:KYbW] crystal doped with 8%(in mole,the same below) Tm3+ and 1% Ho3+ was grown with K2W2O7 as a flux and Yb3+ as a sensitizer by the Kyropoulos method.The structure of the crystals was analyzed via the X-ray diffractometer(XRD).The infrared and Raman spectra of the crystals were measured,and the assignation of the vibrations of peak value was discussed.The absorption and fluorescence spectra of the Tm,Ho:KYbW crystal was analyzed and the corresponding spectral parameters were calculated.The XRD results show that the grown crystal belongs to a monoclinic β-Tm,Ho:KYbW,space group C2/c.The absorption peaks of Yb3+ are located at 929,962 nm and 1 000 nm and the full width half maximum(FWHM) of the peak is 103 nm in absorption spectra.The fluorescence emission peaks of the Tm,Ho:KYbW crystal are located at 2 048 and 1 626 nm,and the emission FWHM of the chief peak at 2 048 nm is 132 nm,leading to an excellent gain medium for tunable laser.The upconversion fluorescence spectrum of the crystals indicate that the upconversion blue light of 467 nm and near-infrared light of 782 nm can be obtained.There exists the Tm3+ and Ho3+ cross relaxation.In addition,the corresponding upcon-version mechanism is also analyzed.更多还原