【摘要】 在一个非简并三能级梯型原子系统中，通过调谐探测场的强度，从理论和实验上研究了探测场通过铷原子蒸气的传输谱线。当探测场不再足够弱时，通过缀饰微扰链的方法推导了探测场响应的表达式并预言了电磁诱导吸收(electromagnetically induced absorption, EIA)的存在。实验上，在室温铷原子的D2线中，当弱探场状态切换到强探测状态时，不局限于单光子共振条件，电磁感应透明(electromagnetically induced transparency, EIT)向EIA的转换在探测场的不同失谐量处被实现。利用缀饰能级图分析了强的探测场和耦合场产生的二级缀饰态之间的相长干涉是EIA形成的主要原因。由于EIT和EIA的许多应用依赖于共振附近的异常色散，这个结果引入了控制色散符号的新能力。更多还原

【Abstract】 In a nondegenerate three-level ladder-type atomic system, the transmission spectrum of a probe field through the rubidium atomic vapor, theoretically and experimentally, was investigated by tuning the probe field intensity. An expression for the probe response was derived analytically by using the dressed perturbation method, which predicted the existence of electromagnetically induced absorption(EIA) when the probe field was no longer weak enough. Experimentally, in the D2 line of rubidium atom in a room temperature vapor cell,when switching from weak probe field to strong probe field, it was not limited to the single photon resonance condition, and the conversion of electromagnetically induced transparency(EIT) into EIA at different probe detuning was realized. The main reason for the formation of EIA was the constructive interference between secondary dressed states generated by strong probe field and coupling field, which was analyzed by using the dressed-state image. Since many applications of EIT and EIA relied on an anomalous dispersion near the resonance, a new ability to control the sign of the dispersion was introduced.更多还原