泡生法生长Ho^(3+),Yb^(3+)双掺KGd(WO_4)_2晶体及其光谱性能

Growth of Ho^(3+),Yb^(3+) Co-Doped KGd(WO_4)_2 Crystal by Kyropoulos Method and Its Spectral Property

钨酸钆钾(KGd(WO4)2,简称KGW)是一种新型的激光基质材料。以Yb3+作为Ho3+的敏化剂,采用泡生法生长出了单斜晶系的Ho∶Yb∶KGW晶体。通过X射线衍射仪(XRD)分析确认所生长的晶体为-βHo∶Yb∶KGW。热重与差热分析(TG-DTA)测试结果表明,晶体的熔点为1072.31℃,相变温度为1043.09℃。测试了晶体的吸收光谱,对吸收峰值归属进行了确认,计算了相应的光谱参数。Yb3+在981 nm处吸收峰较强,半峰全宽(FWHM)为14 nm。从荧光光谱可以看出,在1022 nm附近,Yb3+发射主峰的半峰全宽达16 nm,对应的是Yb3+的2F5/2和2F7/2的能级之间的跃迁;Ho3+在1985 nm处的荧光发射峰半峰全宽为45 nm左右,发射截面积为1.79×10-20cm2。

Potassium gadolinium tungstate （KGd（WO4）2, KGW） is a new kind of laser matrix material. With Yb^3＋ as sensitizer for Ho^3＋ , monoclinic-like Ho： Yb： KGW crystal has been grown by the Kyropoulos method, which is identified as β-Ho： Yb： KGW by X-ray diffractometer （XRD）. The melting point and transition point temperatures of the crystal are 1072.31 ℃, 1043.09 ℃ determined by thermal gravity and differential thermal analysis （TG-DTA）. The absorption spectrum of the crystal has been measured, the assignation of the absorption peak has been discussed, and the corresponding spectral parameter has been calculated. The absorption peaks of Yb^3＋ at 981 nm is intensive, and the full width at half maximum （FWHM） is 14 nm. It is indictaed from photoluminescence spectrum that the emission line width （FWHM） at the chief peak of Yb^3＋ 1022 nm reaches 16 nm, corresponding to the transition between energy levels ^2F5/2 and ^2F7/2 Of Yb^3＋. The photoluminescence emission peak FWHM of Ho^3＋ at 1985 nm is about 45 nm, and the emission cross section is 1.79 × 10^-20 cm^2.