28 January 2005 The dependence of the switching field on the intrinsic defects in lithium niobate crystals
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Abstract
Several near-stoichiometric lithium niobate (LiNbO3) plates for Periodically poled lithium niobate (PPLN) were prepared by vapor transport equilibrium (VTE) technique. External electric field poling was carried out on these samples. A linear dependence of the switching field on the concentration of anti-site niobium ions was observed. This linear relationship was explained by a two-dimensional model based on the dynamics of domain wall. In this model, the bowing of domain wall and the pinning role of anti-site niobium ions to the movement of domain wall were considered. The pinning-depinning transition of domain wall was attributed to the movement of anti-site niobium ions through the oxygen plane, which is due to the change of domain environment round anti-site niobium ions . A parameter of θ, denoting the ratio between the negative and positive domains round anti-site niobium ions , was introduced. The interaction between anti-site niobium ions and rounding domain environment was analyzed associating with the parameter θ. With the help of the shell-model theory, the force needed for anti-site niobium ions to pass through the oxygen plant was given as 1.696×10-9 N and the critical θc corresponding to domain reversal was calculated to be about 67° in degree. Using the fitting result of experiment data, the domain wall energy per unit area for LiNbO3 was also roughly calculated as 0.41 J/m2.
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Wenbo Yan, Yongfa Kong, Lihong Shi, Xiaochun Li, Xiang Xie, Jingjun Xu, Cibo Lou, Hongde Liu, Guangyin Zhang, "The dependence of the switching field on the intrinsic defects in lithium niobate crystals", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.571012; https://doi.org/10.1117/12.571012
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