Ms. Ma Hui Profile

Ma Hui

at Shandong Normal Univ

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Proceedings Article | 4 January 2008 Paper

Propagation of a femtosecond laser pulse in a dense Λ-type three-level atomic medium

Hui Ma, Xijun Fan, Zhizhan Xu

Proceedings Volume 6839, 68390T (2008) https://doi.org/10.1117/12.753636

KEYWORDS: Ultrafast phenomena, Pulsed laser operation, Femtosecond phenomena, Finite-difference time-domain method, Nonlinear optics, Chemical species, Polarization, Physics, Mechanics, Maxwell's equations

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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.

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