Lithium triborate (LBO) crystal is a widely used nonlinear crystal and a potential electro-optic (EO) crystal, but there was no report on experimental verification of its EO characteristics. We verified the linear EO effect of LBO crystal experimentally by designing a second harmonic generation (SHG) experiment. In the experiment, the direction of applied voltage was determined by the analysis of LBO EO tensor matrix. By measuring the curve of voltage-tuning SHG efficiency with different angle detuning, the linear EO effect was verified, and the linear EO coefficient was calculated by the slope of phase mismatch with respect to voltage.

中文翻译：

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基于非线性光学过程的LBO晶体电光效应实验验证

三硼酸锂（LBO）晶体是一种广泛使用的非线性晶体和潜在的电光（EO）晶体，但没有对其EO特性进行实验验证的报道。我们通过设计二次谐波生成 (SHG) 实验，通过实验验证了 LBO 晶体的线性 EO 效应。在实验中，通过分析LBO EO张量矩阵来确定施加电压的方向。通过测量不同角度失谐的电压调谐SHG效率曲线，验证了线性EO效应，并通过相位失配相对于电压的斜率计算线性EO系数。