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arXiv 0812.3211quant-ph
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椭圆偏振laser脉冲诱导的无场分子取向:无创三维表征

Field-free molecular alignment induced by elliptically polarized laser pulses: non invasive 3 dimensional characterization

E. Hertz, D. Daems, S. Guérin, H. R. Jauslin, B. Lavorel, O. Faucher

摘要:

本文报道了椭圆偏振激光脉冲产生的无场分子排列的研究。实验在室温下在CO $_2$中进行。一个非侵入性的全光学技术,基于交叉散焦的探测脉冲,是用来测量沿两个正交方向,这是足以提供一个三维表征的对齐。由椭圆偏振激光产生的无场分子排列在振幅和形状方面与理论预测吻合得很好。它几乎等同于两个单独的交叉极化脉冲所产生的效应的叠加。调查突出了显着的无场的双向排列交替适当选择的程度的椭圆度的发生。这个特定的椭圆率和众所周知的“魔角”用于时间分辨光谱,以防止旋转的贡献之间的类比进行了讨论。

英文摘要:

An investigation of field-free molecular alignment produced by elliptically polarized laser pulses is reported. Experiments are conducted in CO$_2$ at room temperature. A non invasive all-optical technique, based on the cross defocusing of a probe pulse, is used to measure the alignment along two orthogonal directions that is sufficient to provide a 3 dimensional characterization. The field-free molecular alignment produced by a laser of elliptical polarization is in good agreement in terms of amplitude and shape with theoretical predictions. It turns out to be almost equivalent to the superposition of the effects that one would obtain with two individual cross-polarized pulses. The investigation highlights notably the occurrence of field-free two-direction alignment alternation for a suitably chosen degree of ellipticity. The analogy between this specific ellipticity and the well known "magic angle" used in time resolved spectroscopy to prevent rotational contributions is discussed.

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