Field-free molecular orientation enhanced by two dual-color laser subpulses.
Field-free molecular orientation enhanced by two dual-color laser subpulses.
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DOI：
10.1063/1.3610956
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Shian Zhang;Chenhui Lu;T. Jia;Zu-geng Wang;Zhenrong Sun
中科院分区：
文献类型：
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作者：
Shian Zhang;Chenhui Lu;T. Jia;Zu-geng Wang;Zhenrong Sun
在本文中，我们从理论上证明，通过将单个双色激光脉冲分离成两个延时的双色子脉冲，可以显著地增强由单个双色激光脉冲产生的无场分子取向。结果表明，当两个延时双色子脉冲的强度比约为1：2时，在旋转波包再相化开始或第一个双色子脉冲引起的旋转波包退相结束时同时施加第二个双色子脉冲，可以获得最大的分子取向增强。结果还表明，分子取向的增强或抑制可以通过改变第二双色子脉冲的基场与其二次谐波场之间的相对位相来实现，并且在半个旋转周期附近获得增强。
In this paper, we theoretically show that the field-free molecular orientation created by a single dual-color laser pulse can be significantly enhanced by separating it into two time-delayed dual-color subpulses. It is indicated that the maximum enhancement of the molecular orientation created by two time-delayed dual-color subpulses can be achieved with their intensity ratio of about 1:2 and by simultaneously applying the second one at the beginning of the rotational wave packet rephasing or the end of the rotational wave packet dephasing induced by the first one. It is also shown that the enhancement or suppression of the molecular orientation can be coherently manipulated by varying the relative phase between the fundamental field and its second harmonic field of the second dual-color subpulse, and its enhancement is obtained around half rotational period.