State Key Laboratory of Precision Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, People's Republic of China.
J Chem Phys. 2011 Jul 21;135(3):034301. doi: 10.1063/1.3610956.
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.
在本文中，我们从理论上表明，通过将单个双色激光脉冲分离成两个时延迟的双色子脉冲，可以显著增强无场分子取向。结果表明，通过将第二个子脉冲同时施加到第一个子脉冲诱导的旋转波包重相位或去相位的开始时，可以实现两个时延迟双色子脉冲所产生的分子取向的最大增强，其强度比约为 1:2。还表明，可以通过改变第二个双色子脉冲的基场与其二次谐波场之间的相对相位来相干地操纵分子取向的增强或抑制，并且在大约半旋转周期时获得增强。
