Optical gratings induced by field-free alignment of molecules
Optical gratings induced by field-free alignment of molecules
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DOI：
10.1103/physreva.75.013419
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发表时间：
2006-09
影响因子：
2.9
通讯作者：
A. Rouzée;V. Renard;S. Guérin;O. Faucher;B. Lavorel
中科院分区：
文献类型：
--
作者：
A. Rouzée;V. Renard;S. Guérin;O. Faucher;B. Lavorel
利用一种基于诱导含时光栅的方法，分析了由两个不同极化的交叉超短泵浦光脉冲产生的分子的排列。平行偏振产生强度光栅，而垂直偏振产生偏振光栅。我们发现，在中等强度下，这两种构型都可以解释为由单个偏振泵浦脉冲引起的排列。垂直极化的优点是提供了一种不受等离子体影响的排列信号。在室温的CO2环境下，在静态室中和在30K的分子膨胀射流中，分别进行了具有取向分子的飞秒瞬变光栅实验。
We analyze the alignment of molecules generated by a pair of crossed ultra-short pump pulses of different polarizations by a technique based on the induced time-dependent gratings. Parallel polarizations yield an intensity grating, while perpendicular polarizations induce a polarization grating. We show that both configurations can be interpreted at moderate intensity as an alignment induced by a single polarized pump pulse. The advantage of the perpendicular polarizations is to give a signal of alignment that is free from the plasma contribution. Experiments on femtosecond transient gratings with aligned molecules were performed in CO2 at room temperature in a static cell and at 30 K in a molecular expansion jet.