中国物理B ›› 2008, Vol. 17 ›› Issue (11): 4211-4217.doi: 10.1088/1674-1056/17/11/043

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Dynamics of cooperative emissions in a cascade three-level molecular system driven by an ultrashort laser pulse

王春兴1, 刘纪彩2, 王传奎2, Gel'mukhanov Faris3   

  1. (1)College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; (2)College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden; (3)Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
  • 收稿日期:2008-02-06 修回日期:2008-04-09 出版日期:2008-11-20 发布日期:2008-11-20
  • 基金资助:
    Project supported by National Basic Research Program for China (Grant No 2006CB806000), Swedish Research Council, Carl Tryggers Stiftelse Foundation, Swedish International Development Cooperation Agency (SIDA),and Natural Science Foundation of Shandong Province of China (Grant No Z2007A02).

Dynamics of cooperative emissions in a cascade three-level molecular system driven by an ultrashort laser pulse

 Liu Ji-Cai (刘纪彩)ab, Wang Chun-Xin (王春兴)a, Gel'mukhanov Farisb, Wang Chuan-Kui (王传奎)ab    

  1. a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
  • Received:2008-02-06 Revised:2008-04-09 Online:2008-11-20 Published:2008-11-20
  • Supported by:
    Project supported by National Basic Research Program for China (Grant No 2006CB806000), Swedish Research Council, Carl Tryggers Stiftelse Foundation, Swedish International Development Cooperation Agency (SIDA),and Natural Science Foundation of Shandong Province of China (Grant No Z2007A02).

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摘要： This paper investigates the dynamics of cooperative emissions in a cascade three-level system driven by an ultrashort laser pulse by solving numerically the full-wave Maxwell--Bloch equations. The 4, 4$'$-bis(dimethylamino) stilbene molecule is used as the model molecule because of its strong two-photon absorption property. The two-colour cooperative emissions are studied as functions of molecular number density and dephasing rate of the dipole coherence. The propagation effects on the evolution of the cooperative radiations are also taken into account. The cooperative radiations are enhanced for large number density of the molecule, while the fast dephasing of the dipole coherence reduces the intensity of the cooperative radiations and delays the emission times or even inhibits the formation of the emissions. The delay time of the radiation decreases with the increase of the molecular number density and the propagation distance.

关键词: superfluorescence, ultra-short laser pulse, 4, 4$'$-bis(dimethylamino) stilbene organic molecule, Maxwell--Bloch equations

Abstract: This paper investigates the dynamics of cooperative emissions in a cascade three-level system driven by an ultrashort laser pulse by solving numerically the full-wave Maxwell--Bloch equations. The 4, 4$'$-bis(dimethylamino) stilbene molecule is used as the model molecule because of its strong two-photon absorption property. The two-colour cooperative emissions are studied as functions of molecular number density and dephasing rate of the dipole coherence. The propagation effects on the evolution of the cooperative radiations are also taken into account. The cooperative radiations are enhanced for large number density of the molecule, while the fast dephasing of the dipole coherence reduces the intensity of the cooperative radiations and delays the emission times or even inhibits the formation of the emissions. The delay time of the radiation decreases with the increase of the molecular number density and the propagation distance.

Key words: superfluorescence, ultra-short laser pulse, $4$, 4$'$-bis(dimethylamino) stilbene organic molecule, Maxwell--Bloch equations

中图分类号:  (Other multiphoton processes)

  • 33.80.Wz
31.15.xg (Semiclassical methods)