铯原子气室中简并二能级系统的电磁诱导吸收

对于铯原子6^2S1/2(F=4)-6^2P3/2(F’=5)简并二能级系统，在一束较强的耦合光作用下，借助于弱探测光的吸收光谱观察到了电磁诱导吸收现象(EIA)；同时在F=4-F’=3及F=4-F’=4跃迁频率附近观测到了Ⅴ型三能级结构中的电磁诱导透明(EIT)。实验中还研究了耦合光场的强度和失谐对电磁诱导吸收的影响。对该系统中Zeeman子能级间的光抽运作用以及多个简并的二能级系统间相干作用的分析表明：由于光抽运作用的强度影响，Zeeman子能级上的布居数以及参与耦合的二能级的原子数，Zeeman子能级间的相干时间发生了变化，从而影响了电磁诱导吸收的增强峰的线宽以及吸收的强度。

Electromagnetically Induced Absorption of Degenerate Two Level System in a Cesium Vapor Cell

Employing an intense laser field coupling to the degenerate two-level system of cesium 62S1/2(F=4)-62P3/2(F′=5) transition in a cesium vapor cell, electromagnetically induced absorption (EIA) has been demonstrated via probe absorption spectra, at the same time, electromagnetically induced transparency (EIT) of V-type three-level scheme has been demonstrated on the F=4-F′=3 and F=4-F′=4 transition frequency. The EIA is affected by the intensity and detuning of the coupling laser. By analyzing the effect of optical pumping between Zeeman sub-levels on the EIA and the coherent interactions between multiple degenerate two-level atoms, it is shown that the optical pumping affects the population of different Zeeman sub-levels and the number of the involved two-level atoms, the coherent time between the sub-levels is then changed and the linewidth and intensity of the EIA are affected accordingly.