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论文类型：期刊论文

发表时间：2011-11-16

发表刊物：PHYSICAL REVIEW A

收录刊物：Scopus、SCIE、EI

卷号：84

期号：5

ISSN号：1050-2947

摘要：Photoassociation (PA) dynamics of ultracold cesium atoms steered by a modulated two-color laser field E(t) = E(0)f(t)cos(2 pi/T(p) - phi)cos(omega(L)t) is investigated theoretically by numerically solving the time-dependent Schrodinger equation. The PA dynamics is sensitive to the phase of envelope (POE) phi and the period of the envelope T(p), which indicates that it can be controlled by varying POE phi and period T(p). Moreover, we introduce the time- and frequency-resolved spectrum to illustrate how the POE phi and the period T(p) influence the intensity distribution of the modulated laser pulse and hence change the time-dependent population distribution of photoassociated molecules. When the Gaussian envelope contains a few oscillations, the PA efficiency is also dependent on POE phi. The modulated two-color laser field is available in the current experiment based on laser mode-lock technology.