Quantum control of optical four-wave mixing with femtosecond w-3w laser pulses: coherent ac Stark nonlinear spectroscopy

Details Quantum control of optical four-wave mixing with femtosecond w-3w laser pulses: coherent ac Stark nonlinear spectroscopy Quantum control of optical four-wave mixing with femtosecond w-3w laser pulses: coherent ac Stark nonlinear spectroscopy

2005-07-07

arxiv.org/abs/physics/0507061v1

Physics

Optics

4 pages, 4 figures

Scientific paper

The four-wave mixing produced with two ultrashort phase-locked w-3w laser pulses propagating coherently in a two-level system in the infrared spectral region is shown to depend on the pulses relative phase. The Maxwell-Bloch equations are solved beyond the rotating-wave approximation to account for field frequencies which are largely detuned from the atomic resonance. The relative phase dominating the efficiency of the coupling to the 5w anti-Stokes Raman component is determined by sign of the total ac Stark shift induced in the system, in such a way that the phase influence disappears precisely where the ac Stark effect due to both pulses is compensated. This fundamental quantum interference effect can be the basis for nonlinear ultrafast optical spectroscopy techniques.

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