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Springer series in chemical physics

Ac Stark-Mediated Quantum Control with Two-Color Pulses in Two- and Three-Level Systems

Carles Serrat, Yurii V. Loiko

Published Jan 1, 2007• 0 citations
Publisher
DOI
10.1007/978-3-540-68781-8_185

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A critical dependence of the quantum interference on the optical Stark spectral shift produced when two-color laser pulses interact with a two-level medium is observed. The four-wave mixing of two ultrashort phase-locked $\ensuremath{\omega}\text{\ensuremath{-}}3\ensuremath{\omega}$ laser pulses propagating coherently in a two-level system depends on the pulses' relative phase. The phase dominating the efficiency of the coupling to the anti-Stokes Raman component is found to be determined by the sign of the total ac Stark shift induced in the system, in such a way that the phase sensitivity disappears precisely where the ac Stark effect due to both pulses is compensated. A coherent control scheme based on this phenomenon can be contemplated as the basis for nonlinear optical spectroscopy techniques.