Growth and characterization of near stoichiometric LiNbO3 single crystal by S. H. Yao, X. B. Hu, J. Y. Wang, H. Liu, L. Gao, X. F. Cheng, X. Yin, and X. F. Chen

Crystal Research and Technology

Cryst. Res. Technol. 42, 114 (2007) - Abstract -

Growth and characterization of near stoichiometric LiNbO₃ single crystal

S. H. Yao, X. B. Hu, J. Y. Wang, H. Liu, L. Gao, X. F. Cheng, X. Yin, and X. F. Chen

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China

Keywords	Czochralski method, near-stoichiometric, LiNbO₃ crystal
PACS	61.72.Hh, 77.84.Dy, 77.80.Fm
DOI	10.1002/crat.200610782

A near stoichiometric LiNbO₃ single crystal has been grown by the Czochralski method from a 58.5% Li melt hold in a large platinum crucible. High resolution X-ray rocking curves of 30-30 and 0006 reflections indicated that the near stoichiometric LiNbO₃ crystal possesses the high structural quality. Compared with the congruent LiNbO₃, the near stoichiometric LiNbO₃ possesses shorter ultraviolet absorption edge, thus higher Li concentration. The OH^- infrared absorption band analyses showed that the Li concentration in the near stoichiometric LiNbO₃ crystal is higher than that in the congruent LiNbO₃ crystal. This result is in good agreement with that of the ultraviolet absorption edge. The electro-optic coefficient of the near stoichiometric LiNbO₃ crystal was measured to be 6.75 pm/V higher than that of congruent LiNbO₃ crystal. It also proves the near stoichiometric LiNbO₃ electro-optic Q-switched requires a low driving voltage and it is advantageous for the device performance.

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