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采用提拉法生长了尺寸为φ(30～35)mm×80mm的掺钕钨酸钆钠[Nd:NaGd(WO4)2,Nd:NGW]晶体。生长Nd:NGW晶体的最佳工艺参数为:晶体的提拉速率为1～2mm/h,晶体转速为15～18r/min,冷却速率为10℃/h,液面上轴向温度梯度为0.7～1℃/mm。通过热重-差热分析(thermogravimetry-differential thermal analysis,TG-DTA),X射线衍射(X-ray diffraction,XRD)对晶体进行表征。测试了晶体的红外及Raman光谱,分析了晶体的振动模式,并将晶体振动光谱进行归属。由TG-DTA曲线得到晶体熔点为1251.7℃。XRD分析表明:晶体属于四方晶系、白钨矿结构、I41/a空间群,晶胞参数a=0.53213nm,c=1.13070nm。吸收光谱表明:Nd:NGW晶体在805nm附近有较强、较宽的吸收峰,吸收截面积为3.581×10-20cm2,适合于激光二极管泵浦。
Neodymium gadolinium tungstate [Nd: NaGd (WO4) 2, Nd: NGW] crystals were grown by Czochralski method with dimensions of φ (30-35) mm × 80mm. The optimum technological parameters of growing Nd: NGW crystal are as follows: the pulling rate of crystal is 1 ~ 2mm / h, the rotating speed of crystal is 15 ~ 18r / min, the cooling rate is 10 ℃ / h, the axial temperature gradient is 0.7 ~ 1 ℃ / mm. The crystal was characterized by thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD). The infrared and Raman spectra of the crystals were tested. The vibrational modes of the crystals were analyzed and the vibrational spectra of the crystals were assigned. The crystal melting point from TG-DTA curve was 1251.7 ° C. XRD analysis showed that the crystal belongs to the tetragonal and scheelite structure, and the space group I41 / a has a unit cell parameter of a = 0.53213 nm and c = 1.13070 nm. The absorption spectra show that the Nd: NGW crystal has a strong and wide absorption peak near 805nm with an absorption cross-sectional area of 3.581 × 10-20cm2, which is suitable for laser diode pumping.