The four-wave mixing susceptibility χ⁽³⁾(ω₁, ω₁, −ω₂) of a system of two-level atoms driven by weak external fields of frequencies ω₁ and ω₂ in a high-Q cavity is evaluated in the presence of atomic collisions. That susceptibility exhibits resonances corresponding to dipole-allowed transitions between the first two excited manifolds of the dressed states and the ground state and also the collision-induced Bloembergen resonances. The resonances corresponding to transitions between the first two manifolds of excited states that characterize the quantum and nonlinear nature of the atom–field interaction are, however, flattened in the absence of collisions. The collisions thus induce the quantum effects in four-wave mixing in a high-Q cavity.

© 1997 Optical Society of America

[Optical Society of America ]

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