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论文类型：期刊论文

发表时间：2012-10-16

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI、Scopus

卷号：86

期号：4

ISSN号：1050-2947

摘要：The formations of Rb-85(2) molecules via photoassociation (PA) steered by two-color laser fields are explored theoretically in order to find an efficient and robust PA scheme. The PA processes steered by the PA pulses modulated by two Gaussian pulses and by two chirped pulses are discussed and compared in detail. The two pulses are coherent in the picosecond range and reach their maxima at the same time. The influences of the linear chirp rate, the frequency difference between two pulses, and the phase shift of the modulated envelope with respect to the maximum of the Gaussian envelope on the PA process are investigated. The yield of photoassociated molecules on vibrational levels with a binding energy of > 1.0 cm(-1) with respect to the 5S + 5P(1/2) dissociation limit can apparently be enhanced by choosing proper pulse parameters. Especially, the two-color laser field modulated by two chirped pulses can raise the PA efficiency on one side, and weaken the dependence of the PA process on phase shift on the other side.