Growth of near-stoichiometric LiNbO<SUB>3</SUB> crystals and Li<SUB>2</SUB>O contents determination by D. L. Sun, Y. Hang, L. H. Zhang, G. Z. Luo, S. N. Zhu, P. K. Lim, and W. W. Hung

Crystal Research and Technology

Cryst. Res. Technol. 39, 511 (2004) - Abstract -

Growth of near-stoichiometric LiNbO₃ crystals and Li₂O contents determination

D. L. Sun, Y. Hang*, L. H. Zhang, G. Z. Luo**, S. N. Zhu**, P. K. Lim***, and W. W. Hung***

Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, HeFei, Anhui, 230031, P. R. China
*Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201821, P. R. China
**State Key Laboratory of Solid Microstructures, Nanjing University, Nanjing, Jiangshu, 210093, P. R. China
***Department of Physics, Hong Kong Baptist University, Hong Kong, P. R. China

Keywords	LiNbO₃ crystal, stoichiometric, ultraviolet absorption edge, coercive field
PACS	42.70.Mp, 81.10.Dn, 77.80.Fm
DOI	10.1002/crat.200310219

Two kinds of near-stoichiometric LiNbO₃ crystals (SLN11 and SLN19) were grown by a flux pulling method from stoichiometric melt with addition of 11mol%K₂O and 19mol%K₂O, respectively. Compared with the congruent melting LiNbO₃, the ultraviolet absorption edges of two crystals shift towards shorter wavelengths, and the locations of the OH- infrared absorption band have obvious change and the bandwidths become greatly narrower. From these experimental results, the Li₂O contents are determined indirectly to be about 49.6mol% for SLN11 and 49.9mol% for SLN19, respectively. The Li₂O content in SLN19 is very close to the ideal value of 50mol%. The coercive fields of two crystals were measured by the poling method at room temperature. A linear relationship between the Li₂O content and the coercive field was fitted.

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