Optical absorption spectra of LiNbO3, Fe:LiNbO3, and Zn:Fe:LiNbO3 single crystals grown by Bridgman method by Haiping Xia, Xianlin Zeng, Jinhao Wang, Jianli Zhang, Jian Xu, Yuepin Zhang, and Qiuhua Ni

Crystal Research and Technology

Cryst. Res. Technol. 39, 337 (2004) - Abstract -

Optical absorption spectra of LiNbO₃, Fe:LiNbO₃, and Zn:Fe:LiNbO₃ single crystals grown by Bridgman method

Haiping Xia, Xianlin Zeng, Jinhao Wang, Jianli Zhang, Jian Xu, Yuepin Zhang, and Qiuhua Ni

Key Laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, P. R. China

Keywords	single crystal, lithium niobate, doped lithium niobate, optical absorption spectra, Bridgman method, Fe2+ ion, Zn2+ ion
PACS	78.20.Ci, 78.20.Ek, 81.10.-h, 81.10.Fq
DOI	10.1002/crat.200310192

The optical absorption spectra of LiNbO₃ (LN), Fe:LiNbO₃ (Fe:LN), and Zn:Fe:LiNbO₃ (Zn:Fe:LN) single crystals grown by Bridgman method were measured and compared. The absorption characteristics of the samples and the effects of growth process conditions on the absorption spectra were investigated. The Fe, Zn and Li concentrations in the crystals were analyzed by inductively coupled plasma (ICP) spectrometry. The results indicated that the overall Fe ion and Fe²⁺ concentration in Fe:LN and Zn:Fe:LN crystals increased along the growing direction. The incorporation of ZnO in Fe:LN crystal induced increase of Fe²⁺ in the crystal. Among Fe-doped and Zn:Fe-codoped LN single crystals, 3 mol% ZnO doped Fe:LN had a biggest change of Fe²⁺ ion concentration from bottom to top part of crystal. The effects of technical conditions (atmosphere and thermal history) on Fe²⁺ ion concentration were discussed.

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