Recently, Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals present tremendous potential in optical applications such as Q-switches and invisible robotic devices because they possess high electro-optic properties and perfect transparency simultaneously. However, due to the difficulties in testing and sample preparation, the nonlinear optical properties of PMN-PT single crystals have not been reported yet, which poses a bottleneck for exploring its nonlinear application. In this work, a large second-order nonlinear coefficient (d31 ∼ 77.9 pm V−1) of single domain PMN-0.39PT single crystal has been revealed, which is times times higher than the maximum nonlinear coefficient of commercial LiNbO3 single crystal (d33 = 25.4 pm V−1). The complete set of nonlinear coefficients of the sample has been determined by second harmonic generation microscopy. This work presents the promising nonlinear optical property in PMN-PT single crystals and opens a door for designing high-performance nonlinear optical devices.

中文翻译：

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单畴四方PMN-PT单晶的高二阶非线性


近年来，Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT)单晶在Q开关和隐形机器人设备等光学应用中展现出巨大的潜力，因为它们同时具有高电光性能和完美的透明度。然而，由于测试和样品制备困难，PMN-PT单晶的非线性光学性质尚未见报道，这给探索其非线性应用带来了瓶颈。该工作揭示了单畴PMN-0.39PT单晶的大二阶非线性系数（d31∼77.9 pm V−1），是商用LiNbO3单晶最大非线性系数（d33 = 25.4 下午 V−1)。样品的完整非线性系数集已通过二次谐波发生显微镜确定。这项工作展示了 PMN-PT 单晶的非线性光学特性，为设计高性能非线性光学器件打开了大门。