Active manipulation of the selective alignment by two laser pulses

作     者：杨增强 郭志荣 葛桂贤 

作者机构：Key Laboratory of Ecophysics and Department of PhysicsNormal CollegeShihezi University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2010年第19卷第9期

页      面：331-338页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 070203[理学-原子与分子物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the initial research fund for High Level Talents of Shihezi University China (Grant No.RCZX200743) 

主　　题：rotational wave packets femtosecond laser pulses time delay 

摘      要：This paper solves numerically the full time-dependent Schrodinger 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.