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Physics Letters A

Absolute phase control of spectra effects in a two-level medium driven by two-color ultrashort laser pulses

Keyu Xia, Yueping Niu, Chun-Fang Li, Shangqing Gong

Published Sep 26, 2006• 9 citations
Publisher
DOI
10.1016/j.physleta.2006.09.024

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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.