Control of femtosecond filamentation by field-free revivals of molecular alignment

Control of femtosecond filamentation by field-free revivals of molecular alignment
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通过分子排列的无场恢复控制飞秒成丝

DOI:
10.1134/s1054660x09150444
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发表时间:
2009-07
期刊:
影响因子:
1.2
通讯作者:
Couairon, Arnaud
Couairon, Arnaud
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Wu, Jian;Zeng, Heping;Cai, Hua;Tong, Yuqi;Peng, Yan;Couairon, Arnaud

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我们证明了飞秒激光探针脉冲的成丝动力学可以很容易地控制,只要适当地将其与通过脉冲旋转拉曼激发和超前超短泵浦脉冲制备的预排列分子的量子恢复相匹配。通过泵浦和探针脉冲之间的延迟,调节无场分子排列恢复引起的交叉相位调制,可以很容易地改变成丝过程的几个特征,包括超连续统的产生、在灯丝尾迹中产生的等离子体通道的长度、相关的二次辐射和多重成丝模式。我们表明,分子排列也可用于产生具有极短强度尖峰的锥形波,称为激波x波,并进一步调整自导向强灯丝尾迹中的几个周期激光脉冲的频率。
We show that the filamentation dynamics of a femtosecond laser probe pulse can be readily controlled by properly matching it to the quantum revivals of pre-aligned molecules prepared through impulsive rotational Raman excitation with an advancing ultrashort pump pulse. Several features of the filamentation process including supercontinuum generation, the length of the plasma channel generated in the wake of the filament, the associated secondary radiations and the multiple filamentation pattern are all easily modified by tuning the cross phase modulation induced by the field-free revivals of molecular alignment, through the delay between the pump and the probe pulses. We show that molecular alignment can also be used to generate conical waves with extremely short intensity spike called shocked X-waves and to further tune the frequency of a few-cycle laser pulse in the wake of a self-guided intense filament.
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发表时间: 2009-02
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影响因子: 3.8
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