We show that a combination of a fundamental pulse with linear polarization along the vertical direction and an elliptically polarized second harmonic pulse with both vertical and horizontal electric field components can be used to orient linear molecules efficiently, leading to higher degrees of orientation. Due to this specific combination of polarizations, the asymmetric hyperpolarizability interaction potential, which remains the same as that in a linearly polarized two-color laser field, is created along the vertical component of the elliptically polarized second harmonic pulse. On the other hand, the horizontal component suppresses the otherwise strong symmetric polarizability potential responsible for alignment, increasing the tunneling probability from the shallower potential well to the deeper one. As a result, the degree of orientation increases and can be controlled by changing the intensity of the horizontal component of the elliptically polarized second harmonic pulse. This study is the generalization of the all-optical molecular orientation technique based on the anisotropic hyperpolarizability interaction.

中文翻译：

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线性分子与线性偏振和椭圆偏振两种颜色的激光场的全光取向。

我们表明，沿垂直方向具有线性极化的基本脉冲和具有垂直和水平电场分量的椭圆极化的二次谐波脉冲的组合可用于有效地定向线性分子，从而导致更高的定向度。由于偏振的这种特定组合，沿着椭圆偏振的二次谐波脉冲的垂直分量产生了与线性偏振双色激光场相同的不对称超极化相互作用势。另一方面，水平分量抑制了原本用于对准的强对称极化率，从而增加了从较浅的势阱到较深的势阱的隧穿可能性。结果是，取向度增加并且可以通过改变椭圆偏振的二次谐波脉冲的水平分量的强度来控制。这项研究是基于各向异性超极化性相互作用的全光学分子取向技术的推广。