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Chin. Phys. B, 2014, Vol. 23(1): 013302    DOI: 10.1088/1674-1056/23/1/013302
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Field-free molecular orientation induced by combined femtosecond single- and dual-color laser pulses:The role of delay time and quantum interference

Qin Chao-Chao (秦朝朝)a b, Jia Guang-Rui (贾光瑞)a, Zhang Xian-Zhou (张现周)a, Liu Yu-Fang (刘玉芳)a, Long Jin-You (龙金友)b, Zhang Bing (张冰)b
a Department of Physics, Henan Normal University, Xinxiang 453007, China;
b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
Abstract  The coherent control of field-free molecular orientation of CO with combined femtosecond single- and dual-color laser pulses has been theoretically studied. The effect of the delay time between the femtosecond single- and dual-color laser pulses is discussed, and the physical mechanism of the enhancement of molecular orientation with pre-alignment of the molecule is investigated. It is found that the basic mechanism is based on the creation of a rotational wave packet by the femtosecond single-color laser pulse. Furthermore, we investigate the interference between multiple rotational excitation pathways following pre-alignment with femtosecond single-color laser pulse. It is shown that such interference can lead to an enhancement of the orientation of CO molecule by a factor of 1.6.
Keywords:  molecular orientation      femtosecond dual-color laser pulse      quantum interference  
Received:  22 May 2013      Revised:  26 June 2013      Accepted manuscript online: 
PACS:  33.80.-b (Photon interactions with molecules)  
  37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)  
  33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61077037 and 11274096), the Doctoral Research Fund of Henan Normal University, China (Grant No. qd12109), and the Key Scientific and Basic Technology Research Program of Henan Province, China (Grant Nos. 102102210184 and 122300410109).
Corresponding Authors:  Qin Chao-Chao     E-mail:  qinchao@mail.ustc.edu.cn

Cite this article: 

Qin Chao-Chao (秦朝朝), Jia Guang-Rui (贾光瑞), Zhang Xian-Zhou (张现周), Liu Yu-Fang (刘玉芳), Long Jin-You (龙金友), Zhang Bing (张冰) Field-free molecular orientation induced by combined femtosecond single- and dual-color laser pulses:The role of delay time and quantum interference 2014 Chin. Phys. B 23 013302

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