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Title: Two-photon free-induction decay with electromagnetically induced transparency
Authors: Chen, Jiefei
Lu, Weixin
Wang, Shuyuan
Loy, Michael M.
Wong, George K. L.
Du, Shengwang
Keywords: Coherent optical effects
Multiphoton processes
Nonlinear optics
Issue Date: 1-Jun-2010
Citation: Optics letters, v. 35, no. 11, p. 1923-25
Abstract: We report the observation of coherent two-photon free-induction decay (FID) in a three-level Λ system excited by a low-intensity square-modulated laser pulse. Using electromagnetically induced transparency in a 85Rb cold atomic cloud, for the first time, we observe FID signals with coherence time exceeding the relevant atomic excited-state natural lifetime. Due to the on-resonance enhancement, the two-photon FID signal can be observed at the falling edge without using heterodyne means.
Rights: We would like to give credit to the Optical Society of America for granting us permission to repost this Optics Letters article. The original article is posted on the journal's web site at
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