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论文类型：期刊论文

发表时间：2016-05-01

发表刊物：LASER PHYSICS

收录刊物：SCIE、EI

卷号：26

期号：5

ISSN号：1054-660X

关键字：photoassociation; multiple interaction; ultracold atoms; phase-modulated laser

摘要：We investigate theoretically the photoassociation dynamics of ultracold Rb-85 atoms driven by second- and third-order phase-modulated laser fields. The interplay between the second-order and third-order terms of the phase-modulated pulse has an obvious influence on photoassociation dynamics. The different combinations of the second-order and third-order phase coefficients lead to different pulse shapes. Most of the molecular population in the excited electronic state driven only by the third-order phase pulses can be distributed in a single vibrational level. The second-order term of the phase-modulated pulse can change the instantaneous frequency, and therefore the final population is distributed on several resonant vibrational levels, instead of concentrating on a single level. Although the second- and third-order phase-modulated pulse covers more resonant vibrational levels, the total population on the resonant vibrational levels is much smaller than that controlled only by the third-order phase pulse. In particular, the third-order term of the phase-modulated pulse can weaken the 'multiple interaction' to some degree.