Study of the rationality upon adopting a two-level model to deal with interaction between a long-pulse, circularly-polarized laser and sodium atoms

Lei Ke; Youkuan Li

doi:10.1117/12.829495

1 October 2009 Study of the rationality upon adopting a two-level model to deal with interaction between a long-pulse, circularly-polarized laser and sodium atoms

Lei Ke, Youkuan Li

Author Affiliations +

Proceedings Volume 7476, Optics in Atmospheric Propagation and Adaptive Systems XII; 74760P (2009) https://doi.org/10.1117/12.829495
Event: SPIE Remote Sensing, 2009, Berlin, Germany

Abstract

In this paper we adopt a full density matrix treatment to deal with the interaction between long-pulse, circularly-polarized light and the sodium atoms. The time evolution curve of every 24 sub-state's population probability can be obtained by solving the Bloch equation of twenty-four hyperfine levels. We find that during the long pulse time(more than 100 ns), the final transition is only between the sub-level 3S_1/2 (2,2) and 3P_3/2 (3,3).What is more, the probability of the excited sub-state has become steady. Then we start the comparison between the 2-level model and the full density matrix method to show the rationality of rate equation and 2-level model for the long pulse, circularly-polarized light. We prove the rationality upon adopting 2-level model to deal with interaction between long-pulse, circularly-polarized light and the sodium atoms and thus bring the convenience to solve the interaction. Key words: Sodium beacon, long pulse, circularly polarized light, 2-level atoms, adaptive optics

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Lei Ke and Youkuan Li "Study of the rationality upon adopting a two-level model to deal with interaction between a long-pulse, circularly-polarized laser and sodium atoms", Proc. SPIE 7476, Optics in Atmospheric Propagation and Adaptive Systems XII, 74760P (1 October 2009); https://doi.org/10.1117/12.829495

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