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论文类型：期刊论文

发表时间：2013-07-01

发表刊物：LASER PHYSICS LETTERS

收录刊物：SCIE、Scopus

卷号：10

期号：7

ISSN号：1612-2011

摘要：We theoretically investigate field-free molecular orientation by using an off-resonant two-color shaped laser pulse with a slow turn-on and rapid turn-off and a time-delayed THz laser pulse. It is shown that the molecular orientation can be greatly enhanced by applying this scheme compared to the two-color shaped or THz laser pulse alone. We discuss the effects of the rise time and the electric field amplitude of the two-color shaped laser pulse on molecular orientation, and demonstrate that effective molecular orientation can be achieved by a moderate intensity laser pulse with a short rise time. Furthermore, by changing the delay time between the two-color shaped laser pulse and the THz laser pulse and the carrier envelope phase of the THz laser pulse, the molecular orientation can be enhanced or lowered to some degree.