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arXiv 1912.03045physics.optics
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相干分子转子的光学成像

Optical imaging of coherent molecular rotors

Jérémy Bert, Emilien Prost, Ilia Tutunnikov, Pierre Béjot, Edouard Hertz, Franck Billard, Bruno Lavorel, Uri Steinitz, Ilya Sh. Averbukh, Olivier Faucher

摘要:

短激光脉冲被广泛用于控制分子的旋转自由度和诱导分子的排列、定向、单向旋转和其他类型的相干旋转运动。为了实时跟踪超快旋转动力学,已经提出了几种基于旋转分子的库仑爆炸或从高次谐波的角分布恢复分子取向的产生分子电影的技术。目前的工作提供并证明了一种新的非破坏性的光学方法,直接可视化和记录电影的相干旋转动力学的分子气体。该技术是基于成像的时间相关的偏振动力学的探测光传播通过气体的相干旋转分子。探测脉冲继续通过径向偏振器,然后由相机记录。我们说明的技术,通过实施它与两个例子的时间分辨的旋转动力学:在一个单一的线性偏振激光脉冲激发的分子气体中的取向反排列周期,和单向分子旋转诱导的脉冲与扭曲的偏振。该方法为研究各种复杂的强激光场引起的快速化学转变现象和超快分子动力学开辟了新的途径。

英文摘要:

Short laser pulses are widely used for controlling molecular rotational degrees of freedom and inducing molecular alignment, orientation, unidirectional rotation and other types of coherent rotational motion. To follow the ultra-fast rotational dynamics in real time, several techniques for producing molecular movies have been proposed based on the Coulomb explosion of rotating molecules, or recovering molecular orientation from the angular distribution of high-harmonics. The present work offers and demonstrates a novel non-destructive optical method for direct visualization and recording of movies of coherent rotational dynamics in a molecular gas. The technique is based on imaging the time-dependent polarization dynamics of a probe light propagating through a gas of coherently rotating molecules. The probe pulse continues through a radial polarizer, and is then recorded by a camera. We illustrate the technique by implementing it with two examples of time-resolved rotational dynamics: alignment-antialignment cycles in a molecular gas excited by a single linearly polarized laser pulse, and unidirectional molecular rotation induced by a pulse with twisted polarization. This method may open new avenues in studies on fast chemical transformation phenomena and ultrafast molecular dynamics caused by strong laser fields of various complexities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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