Phys. Rev. A 78, 063830 (2008) [5 pages]Four-wave mixing in ultracold atoms using intermediate Rydberg statesReceived 6 August 2008; published 18 December 2008 Ultracold Rb atoms were used to demonstrate nondegenerate four-wave mixing through a Rydberg state. Continuous 5S-5P-nD two-photon excitation to the Rydberg state was combined with an nD-6P tuned laser in a phase-matched geometry. The angular dependence, spatial profile, and dependence on detuning were investigated, showing good agreement with theory. Under optimum conditions 50% of the radiation was emitted into the phase-matched direction. The directional emission is promising for studying quantum effects in blockaded atom clouds. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.78.063830
DOI:
10.1103/PhysRevA.78.063830
PACS:
42.65.Ky, 32.80.Ee
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