Active manipulation of the selective alignment by two laser pulses

doi:10.1088/1674-1056/19/9/093301

中国物理B ›› 2010, Vol. 19 ›› Issue (9): 93301-093301.doi: 10.1088/1674-1056/19/9/093301

Active manipulation of the selective alignment by two laser pulses

杨增强, 郭志荣, 葛桂贤

Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China

收稿日期:2009-11-26 修回日期:2010-02-08 出版日期:2010-09-15 发布日期:2010-09-15
基金资助:
Project supported by the initial research fund for High Level Talents of Shihezi University, China (Grant No. RCZX200743).

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

Received:2009-11-26 Revised:2010-02-08 Online:2010-09-15 Published:2010-09-15
Supported by:
Project supported by the initial research fund for High Level Talents of Shihezi University, China (Grant No. RCZX200743).

摘要/Abstract

摘要： 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.

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.

Key words: rotational wave packets, femtosecond laser pulses, time delay

中图分类号:

3300

杨增强, 郭志荣, 葛桂贤. Active manipulation of the selective alignment by two laser pulses[J]. 中国物理B, 2010, 19(9): 93301-093301.

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[J]. Chin. Phys. B, 2010, 19(9): 93301-093301.

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Active manipulation of the selective alignment by two laser pulses

Active manipulation of the selective alignment by two laser pulses

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