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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).
机译：我们说明了如何通过附加的时延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。我们能够在系统内的多个旋转状态之间引发不同数量的附加Rabi循环。附加Rabi循环表现为信号检测从零差到外差的检测变化，具体取决于引起的旋转对齐程度。最高的激光强度，在多个旋转状态之间的拉比循环不能解释为几乎完全转换成外差检测信号，这建议了涉及电离的第二种机理。我们对这些效应进行了分析，涉及在中等温度下拉比循环形成静态对准激光强度和可能最高强度的离子光栅似乎与实验一致这些发现可以为在类似的DFWM实验中在高激光场强度（> 10〜13 W / cm〜2）下从零差检测转换为外差检测提供可行的解释。

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