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- W1966351702 abstract "A sequence of two femtosecond pulses---a strong driving $ensuremath{pi}$-polarized pulse and a weak propagating $ensuremath{sigma}$-polarized pulse---excites resonantly the ${S}_{1∕2}ensuremath{rightarrow}{P}_{1∕2}$ transition of an atomic system. Strong interference effects take place in the system between absorption and emission paths leading to a substantial amplification of the $ensuremath{sigma}$ pulse. We study the influence of the fine structure on the medium gain when the contribution of the off-resonant ${P}_{3∕2}$ level is taken into account. A drastic reduction of the medium gain is obtained. This effect is explained within the bright-state--dark-state formalism where the strong driving pulse creates a wave packet that can be trapped in a state---the bright state---leading to a significant reduction of the gain for the $ensuremath{sigma}$ pulse. Finally, we also show that periodical gain dependence with the driving pulse energy exhibits a significant change in its period value (compared with expected Rabi oscillations)." @default.
- W1966351702 created "2016-06-24" @default.
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- W1966351702 date "2007-10-30" @default.
- W1966351702 modified "2023-09-27" @default.
- W1966351702 title "Influence of wave-packet dynamics on the medium gain of an atomic system" @default.
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- W1966351702 doi "https://doi.org/10.1103/physreva.76.045805" @default.
- W1966351702 hasPublicationYear "2007" @default.
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