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Proceedings Paper

Propagation of a femtosecond laser pulse in a dense Λ-type three-level atomic medium
Author(s): Hui Ma; Xijun Fan; Zhizhan Xu
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Paper Abstract

We investigate numerically the propagation behaviors of an ultrashort laser pulse in a dense Λ-type three-level atomic medium by using the full Maxwell-Bloch equations without the slowly varying envelope approximation and the rotating-wave approximation. We find that with propagation distance and time increasing, variations of the Rabbi frequency and the population in a dense medium are quite different from those in a dilute medium even though Lorentz local field correction (LFC) is not considered. In a dilute medium, the populations occupied initially at the ground state are completely transferred into the lower excited-state with the increase of the propagation distance; however, in the dense medium, about a half is still kept on the ground state and the others are transferred into the lower excited-state. The population oscillation occurs at the input surface of a dense three-level medium due to carrier-wave Rabi oscillation, and the oscillating time with LFC is much longer than that without LFC; the time derivative of the electric field has stronger effects on the time evolution of the pulse in the dense medium than that in a dilute medium, which is clearly shown from the time evolution of the Rabi frequency; especially the oscillating amplitude with LFC in the trailing edge of the pulse is larger than that without LFC at the input surface of the three-level medium.

Paper Details

Date Published: 4 January 2008
PDF: 9 pages
Proc. SPIE 6839, Nonlinear Optics: Technologies and Applications, 68390T (4 January 2008); doi: 10.1117/12.753636
Show Author Affiliations
Hui Ma, Shandong Normal Univ. (China)
Xijun Fan, Shandong Normal Univ. (China)
Zhizhan Xu, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 6839:
Nonlinear Optics: Technologies and Applications
Yiping Cui; Qihuang Gong; Yuen-Ron Shen, Editor(s)

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