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Optics & Laser Technology

Realization of population inversion in a two-level system by damping field

Fang-Yu Hong, Shi‐Jie Xiong, Yang Xiang

Published Apr 19, 2008• 0 citations
Publisher
DOI
10.1016/j.optlastec.2008.02.008

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Abstract We study the effects of coupling between molecular vibrational modes attendant the excitation of Raman transitions. Raman active vibrational modes are described by two two‐level systems (TLSs) with nondegenerate ground states. The population inversion is investigated under the condition of zero relative phase between initially populated states. We use two ultrafast laser pulses for the pump and the Stokes fields that have chirps the same in the magnitude and opposite in the sign. Within this model, the coupling induces nonadiabatic effects leading to a diverse population distribution. By introducing the time delay between the Stokes and the pump pulse, we realized a complete population transfer in both coupled TLSs. We demonstrated the population inversion in a more generic case of the averaged initial relative phase. © 2012 Wiley Periodicals, Inc.

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The atomic population inversion in a system of a two-level atom interacting with the Schrdinger cat state light field was studied by solving the Milburn equation.The effect of intrinsic decoherence,the strength of light field and the phase angle between the two coherence states on atomic population inversion were analyzed.The results show that the atomic population inversion decreases to zero with the evolvement of time under intrinsic decoherence.The atomic population inversion damps strongly with the reducing of the intrinsic decoherence as the strength of light field is at a fixed value.The atomic population inversion decreases quickly in an odd coherent state but slowly in an even coherent state.The value of atomic population inversion in a Yurke-Stoler coherent state is between them.When the intrinsic decoherence keeps at the fixed level,the collapse and revival phenomena will be appear with the increase of the strength of light field.Rabi oscillation damps to zero faster.
Abstract We study the effects of coupling between molecular vibrational modes attendant the excitation of Raman transitions. Raman active vibrational modes are described by two two‐level systems (TLSs) with nondegenerate ground states. The population inversion is investigated under the condition of zero relative phase between initially populated states. We use two ultrafast laser pulses for the pump and the Stokes fields that have chirps the same in the magnitude and opposite in the sign. Within this model, the coupling induces nonadiabatic effects leading to a diverse population distribution. By introducing the time delay between the Stokes and the pump pulse, we realized a complete population transfer in both coupled TLSs. We demonstrated the population inversion in a more generic case of the averaged initial relative phase. © 2012 Wiley Periodicals, Inc.