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
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
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.
Received: 06 February 2008
Revised: 09 April 2008
Accepted manuscript online:
Fund: 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).
Cite this article:
Liu Ji-Cai (刘纪彩), Wang Chun-Xin (王春兴), Gel'mukhanov Faris, Wang Chuan-Kui (王传奎) Dynamics of cooperative emissions in a cascade three-level molecular system driven by an ultrashort laser pulse 2008 Chin. Phys. B 17 4211
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