Growth and Optical Spectra of Zn∶Er∶LiNbO_3 Crystals by Bridgman Method

作     者：Wang Jinhao Zhang Jianli Zhang Yuepin Xia Haiping 

作者机构：Laboratory of Photo-Electronic Matedals Ningbo University Ningbo 315211 China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2005年第23卷第5期

页      面：563-563页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

主　　题：LiNbO3 crystal Er^3 ＋/Zn^2 ＋ co-doping bridgman method upconverison fluorescence rare earths 

摘      要：The growth of LiNbO3 single crystal with Er^3＋/Zn^2＋ co-doped by the bridgman method and the characteristics of absorption spectra and fluorescence spectra were reported. By means of the optimized con- ditions such as growth rate of 0.8 - 1.5 mm · h^- 1, temperature gradient about 30 - 35℃ ·cm^-1 across the solid-liquid interface and sealed platinum, large size crystals containing Zn^2＋ （3%） and Er^3＋ （0.6%） with good optical quality were obtained. X-ray diffraction and DTA were used to characterize the crystals. The results indicate that the concentration of Er^3＋ ions in crystals decrease along the growth direction, the absorption intensity and the fluorescence intensity ions also decrease along the growth direction. of Er^3＋ However, for the upper part crystal, the upconversion fluorescence intensity is higher than that of the lower part crystal excited with 800 or 970 nm pump. The effects of crystal lattice, structure defect and effective segregation of Er^3＋ ions were discussed in respect to the variations were discussed of upconversion fluorescence intensity.