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论文类型：期刊论文

发表时间：2015-07-01

发表刊物：LASER PHYSICS

收录刊物：SCIE、EI、Scopus

卷号：25

期号：7

ISSN号：1054-660X

关键字：molecular orientation; two-color femtosecond laser pulse; THz laser pulse

摘要：We propose a scheme for achieving molecular orientation steered by the combination of a nonresonant two-color femtosecond laser pulse and a time-delayed THz laser pulse. It is shown that the molecular negative and positive orientation can be significantly enhanced by applying this scheme compared to the single femtosecond or THz laser pulse. The effects of the intensity of the two-color femtosecond laser pulse and the delay time between the femtosecond laser pulse and the THz laser pulse on molecular orientation are discussed. The molecular orientation also depends on the carrier-envelope phase of the THz laser pulse and the initial rotational temperature of the molecule. The maximal negative and positive orientation degrees calculated are < cos theta >(nmax) = 0.828 and < cos theta >(pmax) = 0.755, respectively.