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Chin. Phys. B, 2017, Vol. 26(8): 083201    DOI: 10.1088/1674-1056/26/8/083201
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Polarization control of multi-photon absorption under intermediate femtosecond laser field

Wenjing Cheng(程文静)1, Pei Liu(刘沛)2, Guo Liang(梁果)1, Ping Wu(吴萍)1, Tianqing Jia(贾天卿)2, Zhenrong Sun(孙真荣)2, Shian Zhang(张诗按)2
1 School of Electrical & Electronic Information, Shangqiu Normal University, Shangqiu 476000, China;
2 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Abstract  

It has been shown that the femtosecond laser polarization modulation is a very simple and well-established method to control the multi-photon absorption process by the light-matter interaction. Previous studies mainly focused on the multi-photon absorption control in the weak field. In this paper, we further explore the polarization control behavior of multi-photon absorption process in the intermediate femtosecond laser field. In the weak femtosecond laser field, the second-order perturbation theory can well describe the non-resonant two-photon absorption process. However, the higher order nonlinear effect (e.g., four-photon absorption) can occur in the intermediate femtosecond laser field, and thus it is necessary to establish new theoretical model to describe the multi-photon absorption process, which includes the two-photon and four-photon transitions. Here, we construct a fourth-order perturbation theory to study the polarization control behavior of this multi-photon absorption under the intermediate femtosecond laser field excitation, and our theoretical results show that the two-photon and four-photon excitation pathways can induce a coherent interference, while the coherent interference is constructive or destructive that depends on the femtosecond laser center frequency. Moreover, the two-photon and four-photon transitions have the different polarization control efficiency, and the four-photon absorption can obtain the higher polarization control efficiency. Thus, the polarization control efficiency of the whole excitation process can be increased or decreased by properly designing the femtosecond laser field intensity and laser center frequency. These studies can provide a clear physical picture for understanding and controlling the multi-photon absorption process in the intermediate femtosecond laser field, and also can provide a theoretical guidance for the future experimental realization.

Keywords:  multi-photon absorption      laser polarization      femtosecond laser field  
Received:  18 April 2017      Revised:  14 May 2017      Published:  05 August 2017
PACS:  32.80.Qk (Coherent control of atomic interactions with photons)  
  32.80.Wr (Other multiphoton processes)  
  42.65.-k (Nonlinear optics)  
Fund: 

Project supported by the Program of Introducing Talents of Discipline to Universities (Grant No. B12024), the National Natural Science Foundation of China (Grant Nos. 51132004, 11474096, 11547216, 11547220, and 11604199), the Science Fund from the Science and Technology Commission of Shanghai Municipality (Grant No. 14JC1401500), and the Higher Education Key Program of He'nan Province of China (Grant Nos. 17A140025 and 16A140030).

Corresponding Authors:  Wenjing Cheng, Pei Liu     E-mail:  0110wenjing@163.com;sazhang@phy.ecnu.edu.cn
About author:  0.1088/1674-1056/26/8/

Cite this article: 

Wenjing Cheng(程文静), Pei Liu(刘沛), Guo Liang(梁果), Ping Wu(吴萍), Tianqing Jia(贾天卿), Zhenrong Sun(孙真荣), Shian Zhang(张诗按) Polarization control of multi-photon absorption under intermediate femtosecond laser field 2017 Chin. Phys. B 26 083201

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