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Active manipulation of the selective alignment by two laser pulses |
| Yang Zeng-Qiang(杨增强)†, Guo Zhi-Rong(郭志荣), and Ge Gui-Xian(葛桂贤) |
| Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China |
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Abstract This paper solves numerically the full time-dependent Schrõdinger equation based on the rigid rotor model, and proposes a novel strategy to determine the optimal time delay of the two laser pulses to manipulate the molecular selective alignment. The results illustrate that the molecular alignment generated by the first pulse can be suppressed or enhanced selectively, the relative populations of even and odd rotational states in the final rotational wave packet can be manipulated selectively by precisely inserting the peak of the second laser pulse at the time when the slope for the alignment parameter by the first laser locates a local maximum for the even rotational states and a local minimum for the odds, and vice versa. The selective alignment can be further optimised by selecting the intensity ratio of the two laser pulses on the condition that the total laser intensity and pulse duration are kept constant.
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Received: 26 November 2009
Revised: 08 February 2010
Accepted manuscript online:
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| Fund: Project supported by the initial research fund for High Level Talents of Shihezi University, China (Grant No. RCZX200743). |
Cite this article:
Yang Zeng-Qiang(杨增强), Guo Zhi-Rong(郭志荣), and Ge Gui-Xian(葛桂贤) Active manipulation of the selective alignment by two laser pulses 2010 Chin. Phys. B 19 093301
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