射频场控制的磁子能级中单色激光吸收抑制

理论上研究了射频场作用下多塞曼能级系统中单色激光的吸收抑制现象.一束单色线偏振或者椭圆偏振的激光作用于铷原子两能级间，线或椭圆偏振矢量方向与磁场方向垂直.在磁场中冷铷原子能级发生分裂，通过一个射频场将这些磁子能级耦合起来.当扫描射频场频率时，计算表明原子对单色光的吸收谱中出现了透射峰，类似于电磁诱导透明现象，光吸收减弱，光场透射增强.对于线性偏振或者椭圆偏振的单色光均能得到透射增强的结果.这种现象完全不同于通常光泵磁共振实验中射频场与磁子能级谐振时光被吸收最多的现象.这种扫描射频场频率时单色光的透射增强现象来自于磁子能级间的相干效应.计算表明在扫描射频场频率时单色光吸收谱中出现的透射峰与射频场的拉比频率和椭圆偏振光的左旋和右旋圆偏振成分相关.这种射频场控制的单色光透射增强效应在磁场测量，光信息处理等领域有潜在的应用价值.

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.