控制场对M型原子系统吸收色散性质的影响

Impact of Controlling Fields on the Absorption-dispersion Properties in an M-type Atomic System

运用数值模拟方法讨论了控制场的变化对M型五能级原子系统相对于探测场的吸收和色散等光学性质的影响.结果表明,改变控制场拉比频率时,系统的吸收和色散性质会发生规律性变化.在特定区域会呈现电磁感应透明窗口,其中透明窗口的数量与外加控制场数目成正比,而透明窗口宽度与拉比频率大小相关,拉比频率越大,透明窗口越平坦,当拉比频率减小,透明窗口变窄同时介质色散增强可获得慢光速光脉冲.

The impact on the absorption-dispersion properties in an M- type five-level atomic system interacting with external fields system are discussed by using numerical analysis. It is shown that changing the control fields can influence the absorption-dispersion properties regularly. The eleetromagnetically induce transparency windows can be obtained if the parameters are taken appropriately. The number of transparency windows is proportion to the number of control fields and the width of the transparency windows is related to Rabi frequencies. It is found that the electromagnetically induce transparency windows in the system narrow gradually as decreasing control fields Rabi frequencies while the dispersion of medium would be enhanced and slow-light would be realized.