Collinear nondegenerate four-wave mixing by a three-level system

M. Pinard, B. Kleinmann, G. Grynberg

Baolong Lü, W. H. Burkett, Min Xiao

Nondegenerate four-wave mixing (NDFWM) in a double-L system of Rb atomic vapor was achieved for collinear pump fields. By comparison of different pump-probe configurations, direct experimental evidence of influence of coherent population trapping on the output power of the NDFWM signal was established. A maximal efficiency for generating the NDFWM signal exists for a moderate pump power in this double-L system.

R. Fantoni, M. Giorgi, L. De Dominicis

Joseph Nilsen, Amnon Yariv

Third-order susceptibilities are calculated for a Doppler-broadened two-level system. The dependence of four-wave mixing on the angle θ between the pump and signal fields is studied, and the reflection coefficient is shown to have a narrow field of view that is inversely proportional to the ratio of the Doppler width to the homogeneous linewidth. For the collinear geometry, θ = 0°, the frequency dependence of the nondegenerate case is analyzed and shown capable of yielding a real-time narrow-bandwidth optical filter whose bandwidth is limited by the homogeneous linewidth.

F. A. M. de Oliveira, Cid Bartolomeu de Araujo, J. R. Rios Leite

Tran Quang, Vladimír Bužek

We have studied the generation of squeezing by nondegenerate four-wave mixing in a system of three-level atoms. The conditions for obtaining a large degree of squeezing in experiments with Rydberg atoms are given.