Summary form only given.We report on the observation of nondegenerate four-wave mixing (NDFWM) in cold atoms via optical pumping-induced population grating transfer between the hyperfine levels of the cesium D/sub 2/ line. Our experiment was performed with cold Cs atoms. The generated phase conjugate (PC) beam, which is nearly counterpropagating with the probe beam, is directly detected by a photodiode.

Conference on Lasers and Electro-OpticsNov 27, 20020 citations

Nonlinear optical memory: theory and experiment

Gabriel C. Borba, D. Felinto, J. W. R. Tabosa

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Optics Communications

Saturated lineshapes and high-order susceptibilities of cold cesium atoms observed via a transferred population grating

George C. Cardoso, J. W. R. Tabosa

Published Sep 1, 2002• 7 citations

Publisher

DOI: 10.1016/s0030-4018(02)01820-5

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The present work explores new possibilities for the selective storage of optical information through higher-order nonlinearities in a sample of cold cesium atoms obtained from a magneto-optical trap. Particularly, we demonstrate the storage of a third-, fifth-, and seventh-order nonlinear atom–light interaction into the coherences and populations of the Zeeman structure of the hyperfine cesium 6S1/2, F=3 ground state. Two writing beams create coherence and population gratings associated with high-order nonlinear processes, which can be selectively retrieved by a reading beam after a controllable storage time. Each kind of grating can store only specific orders of the nonlinear interaction, leading to special features in each signal. Applications of this nonlinear memory to herald multiphotons are discussed.The present work explores new possibilities for the selective storage of optical information through higher-order nonlinearities in a sample of cold cesium atoms obtained from a magneto-optical trap. Particularly, we demonstrate the storage of a third-, fifth-, and seventh-order nonlinear atom–light interaction into the coherences and populations of the Zeeman structure of the hyperfine cesium 6S1/2, F=3 ground state. Two writing beams create coherence and population gratings associated with high-order nonlinear processes, which can be selectively retrieved by a reading beam after a controllable storage time. Each kind of grating can store only specific orders of the nonlinear interaction, leading to special features in each signal. Applications of this nonlinear memory to herald multiphotons are discussed.

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Optical-pumping-induced population-grating transfer between hyperfine levels of the cesium

{D}_{2}

line is observed through four-wave mixing in a sample of cold atoms. Diffraction efficiencies of order of 1% have been measured for a large range of angular apertures. We have studied the angular dependence of the diffracted signal in the limit of small atomic velocities and discussed its application for a nondestructive diagnostic of the trap dynamic. Image processing with nearly degenerate frequency conversion was also demonstrated using this specific mechanism.