| Faraday rotation in a resonant five-level system via electromagnetically induced transparency |
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| 作者姓名： | 杭超 黄国翔 |
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| 作者单位： | Department of Physics East China Normal University，Department of Physics East China Normal University Shanghai 200062，Shanghai 200062 |
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| 基金项目： | The work was supported by the Key Development Pro-gram for Basic Research of China (No. 2005CB724508)，the National Natural Science Foundation of China (No. 10434060 and 90403008)，the PhD Program Schol-arship Fund of ECNU 2006. |
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| 摘 要： | We study the Faraday rotation of polarization of a probe field in a cold, coherently driven five-level system with an M-type configuration. By means of a method of multiple scales we derive two coupled nonlinear envelope equations, which govern the evolution of two circularly polarized components of the probe field. It is shown that due to the quantum interference effect induced by two control fields, one can obtain a large rotation angle with a very low absorption of the probe field. In addition, an efficient control over the polarization state of the probe field in the system can also be easily realized.
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