The restraining absorption of monochromatic light in the cold multi-Zeeman-sublevel atoms controlled by a radio frequency field

The enhanced transmission of a monochromatic laser field controlled by a radio frequency field in the cold multi-Zeeman-sublevel atoms is theoretically investigated. A beam of monochromatic linear polarization or elliptical polarization laser interacts with the rubidium atoms. The linear polarization or elliptical polarization vector direction is perpendicular to the direction of magnetic field. The level of rubidium atom is divided into many sublevels in a magnetic field. These Zeeman sublevels are coupled by a radio frequency(RF) field. The enhanced transmission phenomenon is obtained by tuning the frequency of RF field. Similar to the electromagnetically induced transparency phenomenon, the absorption of light is restrained. The enhanced transmission can be obtained for both linearly polarization and elliptical polarization monochromatic lights. The depth of the transparency window in the absorption spectrum is related to both the Rabi frequency of RF field and the amplitude ratio of the left circularly component and the right circularly component of light. Controlling the transparency windows by the RF field can have potential applications in magnetic-field measurement and quantum information processing. (authors)