标题： 太赫兹电光克尔效应在LaAlO3中 显示英文标题

标题： Terahertz electro-optic Kerr effect in LaAlO3

摘要： 在本信中，我们研究了LaAlO3（LAO）中的太赫兹（THz）电光克尔效应（KE）动力学，LAO是薄膜制备中广泛使用的基底材料。我们表明，由于太赫兹场诱导和应变诱导的光学双折射之间的干涉，KE动力学强烈依赖于材料各向异性。这种干涉导致了KE的准相位匹配条件，这变得对频率非常依赖。根据太赫兹频率，KE表现出二次响应的单极和双极形状。所展示的效果将出现在各种用作不同太赫兹泵浦激光探测实验基底材料中，并需要被考虑以区分测量的超快动态信号的不同贡献。 显示英文摘要

摘要： In this letter, we investigate the terahertz (THz) electro-optic Kerr effect (KE) dynamics in LaAlO3 (LAO), a widely used substrate for thin film preparation. We show that the KE dynamics strongly depend on the material anisotropy due to interference between THz field-induced and strain-induced optical birefringence. Such interference leads to quasi-phase matching conditions of the KE, which becomes strongly frequency dependent. Depending on the THz frequency, the KE exhibits a uni- and bipolar shape of the quadratic response. The demonstrated effects will be present in a wide variety of materials used as substrates in different THz-pump laser-probe experiments and need to be considered in order to disentangle the different contributions to the measured ultrafast dynamic signals.