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首页> 外文期刊>The Journal of Chemical Physics >The influence of intense control laser pulses on homodyne-detected rotational wave packet dynamics in O-2 by degenerate four-wave mixing
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The influence of intense control laser pulses on homodyne-detected rotational wave packet dynamics in O-2 by degenerate four-wave mixing

机译：简并四波混合对强控制激光脉冲对O-2中零差检测到的旋转波包动力学的影响

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摘要

We illustrate how the preparation and probing of rotational Raman wave packets in O-2 detected by time-dependent degenerate four-wave mixing (TD-DFWM) can be manipulated by an additional time-delayed control pulse. By controlling the time delay of this field, we are able to induce varying amounts of additional Rabi cycling among multiple rotational states within the system. The additional Rabi cycling is manifested as a change in the signal detection from homodyne detected to heterodyne detected, depending on the degree of rotational alignment induced. At the highest laser intensities, Rabi cycling among multiple rotational states cannot account for the almost complete transformation to a heterodyne-detected signal, suggesting a second mechanism involving ionization. The analysis we present for these effects, involving the formation of static alignment by Rabi cycling at moderate laser intensities and possibly ion gratings at the highest intensities, appears to be consistent with the experimental findings and may offer viable explanations for the switching from homodyne to heterodyne detection observed in similar DFWM experiments at high laser field intensities (>10(13) W/cm(2)). (C) 2005 American Institute of Physics.
机译：我们说明了如何通过附加的延时控制脉冲来操纵由时间相关的简并四波混合（TD-DFWM）检测到的O-2中旋转拉曼波包的准备和探测。通过控制该字段的时间延迟，我们能够在系统内的多个旋转状态之间引起不同数量的附加Rabi循环。额外的拉比循环表现为信号检测的变化，从检测到的零差到检测到的外差，取决于所感应的旋转对准程度。在最高激光强度下，多个旋转状态之间的拉比循环无法解释几乎完全转换成外差检测信号的现象，这表明了涉及电离的第二种机制。我们针对这些效应进行的分析，包括在中等激光强度下通过拉比循环形成静态对准，并可能在最高强度下通过离子光栅形成静态对准，这似乎与实验结果一致，并且可能为从零差转变为外差提供了可行的解释在类似的DFWM实验中在高激光场强度（> 10（13）W / cm（2））时观察到的检测。 （C）2005美国物理研究所。

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