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Suppressing the weakly bound states in the photoassociation dynamics by a frequency cut-off laser pulse |
| Lin Feng(林峰), Zhang Wei(张为), Zhao Ze-Yu(赵泽宇), and Cong Shu-Lin(丛书林)† |
| School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
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Abstract 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.
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Received: 05 December 2011
Revised: 19 December 2011
Accepted manuscript online:
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PACS:
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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34.50.Rk
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(Laser-modified scattering and reactions)
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82.50.Nd
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(Control of photochemical reactions)
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82.53.Kp
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(Coherent spectroscopy of atoms and molecules)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974024) and the SRFDP, China (Grant No. 20090041110025). |
Corresponding Authors:
Cong Shu-Lin
E-mail: shlcong@dlut.edu.cn
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Cite this article:
Lin Feng(林峰), Zhang Wei(张为), Zhao Ze-Yu(赵泽宇), and Cong Shu-Lin(丛书林) Suppressing the weakly bound states in the photoassociation dynamics by a frequency cut-off laser pulse 2012 Chin. Phys. B 21 073203
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