On negative dispersion without absorption in bichromatically driven two-level systems |
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| Authors: | Carsten Szymanowski Andreas Wicht Karsten Danzmann |
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| Affiliation: | 1. Laboratoire de Chimie Physique—Matière et Rayonnement, 11 rue Pierre et Marie Curie, Université Pierre et Marie Curie Paris VI , F-75 231, Paris Cedex 05, France;2. Institut für Atom- und Molekülphysik, Universit?t Hannover , Appelstra?e 2, D-30 167, Hannover, Germany |
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| Abstract: | Abstract The possibility of obtaining strong negative dispersion without absorption in the central resonance structure of the spectrum of a bichromatically driven two-level system is investigated. A nonlinear analysis is performed using the technique of continued fractions with respect to the dressedstate basis of a strong pumping laser. We discuss the transition between the two regimes of the monochromatic driving case with a weak probing laser and of nearly equally strong lasers in terms of the contributions from coherences and populations of these dressed states. In contrast with the strong dependence of the Rabi side bands on probe field intensity, we find a remarkable stability of the negative dispersion in the central resonance structure. |
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