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Nonlinear Faraday rotation in electromagnetically induce transparency medium

Zhang Wei-Xi She Yan-Chao Wang Deng-Long

Nonlinear Faraday rotation in electromagnetically induce transparency medium

Zhang Wei-Xi, She Yan-Chao, Wang Deng-Long
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Publishing process
  • Received Date:  25 August 2010
  • Accepted Date:  18 September 2010
  • Published Online:  05 March 2011

Nonlinear Faraday rotation in electromagnetically induce transparency medium

  • 1. (1)Department of Physics and Electronic Science, Tongren University, Tongren 554300, China; (2)Department of Physics and Electronic Science, Tongren University, Tongren 554300, China; Department of Physics, Key Laboratory of Quantum Engineering and Micro-Nano Energy Technology of Education Bureau of Hunan Province, Xiangtan University, Xiangtan 411; (3)Department of Physics, Key Laboratory of Quantum Engineering and Micro-Nano Energy Technology of Education Bureau of Hunan Province, Xiangtan University, Xiangtan 411105, China

Abstract: By using multiple-scale methods, we study analytically the propagation properties of the weak linear polarization probe optical field in a cold lifetime-broadened five-level V type atomic system via electromagnetically induced transparency. It is shown that with the strength of the coupling field increasing, the absorption of the probe optical field decreases rapidly and the group velocity of the probe optical field increases quickly under the consideration of linear effect. However, the velocity is several orders of magnitude slower than the light speed in vacuum. Meanwhile, we find that for the same magnetic field the nonlinear Faraday rotation direction is opposite to linear Faraday rotation, and its rotation angle grows bigger than that of linear Faraday rotation. These results mean that the Faraday rotation of the electromagnetically induced transparency medium can be controlled by the nonlinear effect.

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