TY - JOUR
T1 - Realization of population inversion under nonadiabatic conditions induced by the coupling between vibrational modes via Raman fields
AU - Patel, Vishesha
AU - Malinovskaya, Svetlana A.
PY - 2012/12/15
Y1 - 2012/12/15
N2 - 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.
AB - 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.
KW - Raman transitions
KW - coupling between vibrational modes via external fields
KW - population inversion
KW - ultrafast chirped laser pulse
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U2 - 10.1002/qua.24198
DO - 10.1002/qua.24198
M3 - Article
AN - SCOPUS:84869095595
SN - 0020-7608
VL - 112
SP - 3739
EP - 3743
JO - International Journal of Quantum Chemistry
JF - International Journal of Quantum Chemistry
IS - 24
ER -