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Physical Review A

Squeezed-radiation-enhanced four-wave mixing in intense pumps

G. V. Varada, G. S. Agarwal

Published Sep 1, 1989• 0 citations
Publisher

Abstract

The nature of the nonlinear response of a quantum system in the presence of broadband squeezed radiation is examined. The relaxation of the system in the presence of squeezed radiation leads to enhancement of the four-wave-mixing signal.
DOI
10.1103/physreva.40.2792

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The dynamical behavior of a two-level atom under the influence of two intense pump beams is examined. Exact equations for the nonlinear susceptibilities to all orders in the field strengths are derived. Numerical results for the nonlinear susceptibilities giving the absorption of the radiation from either of the pump beams and the generation of the four-wave mixing signal are given. The susceptibility for four-wave mixing, in addition to showing various saturation peaks, shows a peak at ω1 = ω2 even in the case of radiative relaxation. Higher-order multiphoton peaks in the absorption spectra are found to be extremely sensitive to the temporal fluctuations in the pumps.
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A study of the effects of relaxation times on the Four-Wave Mixing (FWM) signal response in frequency space for a two-level system is presented where the collisional effects of the solvent and the presence of the electromagnetic field are considered. The model is a generalization of the conventional two-level approach in that it includes a simplified description of the molecular structure associated with the non-zero permanent dipole moments. Significant changes in both the FWM-intensity and nonlinear optical properties are observed, due mainly to changes in the ratio between the longitudinal and transversal relaxation times.