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Growth and Optical Spectra of Zn∶Er∶LiNbO_3 Crystals Using Bridgman Method 被引量:2

Growth and Optical Spectra of Zn∶Er∶LiNbO_3 Crystals Using Bridgman Method
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摘要 The growth of LiNbO3 single crystal with Er^3+ and Zn^2+ co-doped using Bridgman method and its characteristic absorption spectra and fluorescence spectra were reported. Large-size crystals initially containing Zn^2+ (3%) and Er^3+ (0.6%) with good optical quality were obtained using optimized conditions such as a growth rate of 0.8- 1.5 mm·h^-1 and a temperature gradient of about 30 - 35℃·cm^-1 across the solid-liquid interface and the sealed platinum crucible. X-ray diffraction and differential thermal analysis (DTA) were used to characterize the crystals. The results indicate that the concentration of Er^3+ ions in crystals, their absorption intensity, and their fluorescence intensity decrease from the bottom to the top in the crystals. However, for the upper part of the crystal, the up-conversion fluorescence intensity is higher than that of the lower part excited by an 800 or 970 nm pump. The effects of the crystal lattice, their structural defect and their effective segregation of Er^3+ ions were discussed with respect to the variations of the up-conversion fluorescence intensity. The growth of LiNbO3 single crystal with Er^3+ and Zn^2+ co-doped using Bridgman method and its characteristic absorption spectra and fluorescence spectra were reported. Large-size crystals initially containing Zn^2+ (3%) and Er^3+ (0.6%) with good optical quality were obtained using optimized conditions such as a growth rate of 0.8- 1.5 mm·h^-1 and a temperature gradient of about 30 - 35℃·cm^-1 across the solid-liquid interface and the sealed platinum crucible. X-ray diffraction and differential thermal analysis (DTA) were used to characterize the crystals. The results indicate that the concentration of Er^3+ ions in crystals, their absorption intensity, and their fluorescence intensity decrease from the bottom to the top in the crystals. However, for the upper part of the crystal, the up-conversion fluorescence intensity is higher than that of the lower part excited by an 800 or 970 nm pump. The effects of the crystal lattice, their structural defect and their effective segregation of Er^3+ ions were discussed with respect to the variations of the up-conversion fluorescence intensity.
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第5期533-537,共5页 稀土学报(英文版)
基金 Project supported by Scientific Research Fund of Zhejiang Provincial Education Department (20061660) Foundation ofNingbo University (xk200435)
关键词 LiNbO3 crystal Er^3+ Zn^2+ co-doped up-conversion fluorescence rare earths LiNbO3 crystal Er^3+ , Zn^2+ co-doped up-conversion fluorescence rare earths
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