近化学计量比掺锆铌酸锂晶体的畴反转研究.docVIP

 n The study of domain reversal in the near-stoichiometric ZrO2-doped lithium niobate crystals# Liang Qirui, Zhang Rong, Zhu Meiling, Liu Hongde** 5 10 15 20 25 30 35 40 (MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, TianJin 300071) Abstract: Domain reversal of near-stoichiometric ZrO2-doped lithium niobate crystals was investigated. In the experiment, we observed the quadrangle domains with smaller size. The merging process of the neighboring domain walls stayed still for several minutes in the low electric field. The switching electric field for the backward domain reversal changed with the change of the forward electric field. However, these differences were diminished with the decreasing concentration of zirconium ions. The coercive field for the forward domain reversal is 900 V/mm in 0.5mol% ZrO2 doped near-stoichiometric lithium niobate crystals. With the low coercive field, near stoichiometric ZrO2-doped lithium niobate crystals would be a promising material for periodically poled lithium niobate with larger size. Keywords: near-stoichiometric lithium niobate; zirconium doped; domain reversal 0 Introduction With the large electro-optic and nonlinear optical coefficients, lithium niobate has become one of the most important and widely applied optical materials. The domain engineering in the LiNbO3 crystal is significant for many applications, such as nonlinear optics, [1] electro-optic device, [2] photonic crystals, [3] and ferroelectric data storage. [4] Periodically poled lithium niobate (PPLN) has been developed into one of the most versatile nonlinear optical materials over the past ten years. Much interest in the phenomenon has been generated by simply applying external electric field poling, since it does not require high temperature and is able to produce vertical domain walls persisting through the entire thickness of the crystal. [5-8] However, PPLN suffers from thickness limitations: the risk of diel