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Influence of MgO codoping on Er concentration in congruent LiNbO3 crystal: Mg threshold concentration effect

Published online by Cambridge University Press:  31 January 2011

De-Long Zhang*
Affiliation:
Department of Opto-electronics and Information Engineering, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, People's Republic of China; Key Laboratory of Optoelectronics Information and Technical Science (Tianjin University), Ministry of Education, Tianjin 300072, People's Republic of China; and Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
Li-Zhu Zhang
Affiliation:
Department of Opto-electronics and Information Engineering, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Yu-Heng Xu
Affiliation:
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, People's Republic of China; and School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Edwin Yue-Bun Pun
Affiliation:
Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
*
a)Address all correspondence to this author. e-mail: dlzhang@tju.edu.cn
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Abstract

Congruent Er:Mg:LiNbO3 crystals were grown by the Czochralski method from the melts containing fixed 0.5 mol% Er2O3 while varied MgO content ranged from 0.0 to 8.0 mol%. The Mg and Er contents in the crystals were determined by neutron activation analysis. In the presence of Er codopant, the Mg threshold concentration with respect to optical damage is determined from the measured OH absorption spectra. The results show that the Er codopant has less effect on both the Mg threshold concentration and Mg segregation coefficient, which is within 1.13–1.23 as the Mg concentration is below the threshold while within 0.88–0.98 when above the threshold, consistent with the only MgO doping case. On the other hand, the practical Er concentration in the crystal is closely related to the Mg content and shows definite Mg threshold effect. Below the threshold, the Er concentration decreases linearly with the increased Mg concentration in the crystal; above the threshold, the decrease is more remarkable and follows another linear function. The Mg concentration effect on the Er segregation coefficient is discussed from the viewpoint of the Mg doping effect on the solubility of Er ions in the crystal.

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Articles
Copyright
Copyright © Materials Research Society 2010

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Influence of MgO codoping on Er concentration in congruent LiNbO3 crystal: Mg threshold concentration effect
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