%A Lin Feng(林峰), Zhang Wei(张为), Zhao Ze-Yu(赵泽宇), and Cong Shu-Lin(丛书林) %T Suppressing the weakly bound states in the photoassociation dynamics by a frequency cut-off laser pulse %0 Journal Article %D 2012 %J Chin. Phys. B %R 10.1088/1674-1056/21/7/073203 %P 73203-073203 %V 21 %N 7 %U {https://cpb.iphy.ac.cn/CN/abstract/article_113902.shtml} %8 2012-06-01 %X The photoassociation dynamics of ultracold lithium atoms controlled by a cut-off pulse has been investigated theoretically by solving numerically the time-dependent Schrödinger equation using the mapped Fourier grid method. The frequency components of the laser pulse close to the atomic resonance are partly cut off. Compared with the typical Gauss-type pulses, the cut-off pulse is helpful to suppress efficiently the weakly bound states and prepare the associated molecules in the lower vibrational states. Especially, the dependence of photoassociation probability on the cut-off position of the laser pulse is explored.