物理化学学报 >> 2007, Vol. 23 >> Issue (05): 751-756.doi: 10.3866/PKU.WHXB20070525

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用双激光脉冲操纵N2分子取向

杨增强; 周效信   

  1. 西北师范大学物理与电子工程学院, 兰州 730070; 兰州重离子加速器国家重点实验室原子核理论研究中心, 兰州 730000
  • 收稿日期:2006-09-26 修回日期:2006-11-06 发布日期:2007-04-28
  • 通讯作者: 周效信 E-mail:zhouxx@nwnu.edu.cn

Alignment of N2Molecule by Two-pulse Laser

YANG Zeng-Qiang; ZHOU Xiao-Xin   

  1. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, P. R. China; Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, P. R. China
  • Received:2006-09-26 Revised:2006-11-06 Published:2007-04-28
  • Contact: ZHOU Xiao-Xin E-mail:zhouxx@nwnu.edu.cn

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摘要： 利用求解含时薛定谔方程的方法, 研究了双原子N2分子在激光强度为1.5×1014 W·cm-2, 脉冲宽度为50 fs激光脉冲作用下的取向行为. 研究结果表明, 保持总激光强度不变, 将一束激光脉冲分成具有同样脉宽, 强度比为0.3636的两束激光脉冲, 当第一束脉冲产生的分子取向即将达到最大时, 加上有一定延迟时间的第二束脉冲能够使N2分子达到最大的取向程度.

关键词: 双脉冲激光, 分子取向, 延迟时间

Abstract: Field-free alignment of N2 molecule induced by laser pulse with intensity of 1.5×1014 W·cm-2 and duration of 50 fs was investigated by solving time-dependent Schrodinger equation numerically. The results showed that the alignment could be optimized by dividing the laser pulse into two pulses with same duration. The degree of alignment could be maximumwith an intensity ratio of 0.3636 at the appropriate delay time of the second pulse relative to the peak of the first pulse.

Key words: Two-pulse laser, Molecular alignment, Delay time