Bunching-induced asymmetry in degenerate four-wave mixing with cold atoms

Mario Gattobigio (1, 2) , Franck Michaud (1) , Julien Javaloyes (1) , J. W.R. Tabosa (3) , Robin Kaiser (1)

1 INLN - Institut Non Linéaire de Nice Sophia-Antipolis
2 SNS - Scuola Normale Superiore di Pisa
3 Norman Bridge Laboratory of Physics

We have investigated degenerate four-wave mixing in a sample of cold rubidium atoms. A red-blue asymmetry is observed for high intensities of the pumping beams. This asymmetry is explained by the spatial bunching of the atoms in the nodes or antinodes of the strong standing wave of the pump beams. This explanation is confirmed by different experimental configurations and by numerical simulations.

Mots clés: rubidium; laser cooling; multiwave mixing; atom-photon collisions; optical pumping

Domaines: Adaptation et Systèmes auto-organisés [nlin.AO]

Mario Gattobigio, Franck Michaud, Julien Javaloyes, J. W.R. Tabosa, Robin Kaiser. Bunching-induced asymmetry in degenerate four-wave mixing with cold atoms. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2006, 74, pp.043407. ⟨10.1103/PhysRevA.74.043407⟩. ⟨hal-00102286⟩