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Optics Letters

Optics Letters


  • Vol. 23, Iss. 1 — Jan. 1, 1998
  • pp: 70–72

Interaction of atomic wave packets with four-wave mixing: detection of rubidium and potassium wave packets by coherent ultraviolet emission

H. C. Tran, P. C. John, J. Gao, and J. G. Eden  »View Author Affiliations

Optics Letters, Vol. 23, Issue 1, pp. 70-72 (1998)

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The observation of an atomic wave packet by use of a coherent, nonlinear-optical process is reported. Wave packets formed in K or Rb vapor by two-photon excitation of ns and (<i>n</i>-2)<i>d</i>states (<i>n</i>=8 for K; <i>n</i>=11 , 12 for Rb) with red (~620-nm) , 80–100-fs pulses were detected by four-wave mixing in pump-probe experiments. The temporal behavior of the wave packet is observed by monitoring the coherent UV radiation generated near the alkali <i>mp</i><sup>2</sup><i>P</i>→ <sup>2</sup><i>S</i><sub>1/2</sub> (7≤<i>m</i>≤12 for Rb; 5≤<i>m</i>≤7 for K) resonance transitions when a probe pulse is scattered by the wave packet established by the earlier (identical) pump pulse. The spatial and spectral characteristics of the UV emission are well described by axially phase-matched four-wave mixing, and all the prominent frequency components of the wave packets are associated with energy differences between pairs of excited states for which Δι=0 or Δι=2 . These results demonstrate that the wave packet modulates χ<sup>(3)</sup>of the medium, thus rendering the wave packet detectable.

© 1998 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(190.0190) Nonlinear optics : Nonlinear optics
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

H. C. Tran, P. C. John, J. Gao, and J. G. Eden, "Interaction of atomic wave packets with four-wave mixing: detection of rubidium and potassium wave packets by coherent ultraviolet emission," Opt. Lett. 23, 70-72 (1998)

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