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VOLUME 41 (1985) | ISSUE 1 | PAGE 9
Change in the shape of a weak, ultrashort light pulse passing through a medium with a population inversion and a slow phase relaxation
The change in the shape of weak, ultrashort light pulses during a coherent interaction with an amplifying medium has been studied. Shape changes were detected even when the effect of the pulses on the level populations was negligible. These changes are linked with an emission due to a macroscopic polarization produced in the medium by the initial pulse.