Shi Meng, Jiao Yuechun, Zhao Jianming
Opt Express. 2021 Nov 8;29(23):37253-37261. doi: 10.1364/OE.440103.
We investigate the electromagnetically induced transparency (EIT) and Autler Townes (AT) splitting spectrum with a four-level Rydberg atom by pole analysis of the probe coherence. A pair of poles corresponding to the two peaks of the spectral splitting is observed. The spectral split or the pole positions are affected by the microwave intensity (MW) and the detuning between the probe and the coupling laser. In the absence of any detuning, the two poles coincide and separate again on the imaginary axis of the complex detuning plane at weak MW field. The two poles do not coincide when the probe (coupling) laser is detuned for scanning the coupling (probe) laser frequency. However, under finite detuning, the two poles approach the nearest distance in the absence of any splitting and are separated again in the direction parallel to the imaginary axis. The spectral analysis of the poles provides an alternate way to establish the relationship between the splitting and the intensity of MW, which may play a role in the application of atomic-based MW measurements.
我们通过对探测相干性进行极点分析，研究了具有四能级里德堡原子的电磁诱导透明（EIT）和奥特勒-汤斯（AT）分裂光谱。观察到一对对应于光谱分裂两个峰值的极点。光谱分裂或极点位置受微波强度（MW）以及探测光与耦合激光之间失谐的影响。在没有任何失谐的情况下，两个极点重合，并在弱MW场下于复失谐平面的虚轴上再次分开。当探测（耦合）激光失谐以扫描耦合（探测）激光频率时，两个极点不重合。然而，在有限失谐下，两个极点在没有任何分裂的情况下接近最近距离，并在平行于虚轴的方向上再次分开。对极点的光谱分析提供了一种建立分裂与MW强度之间关系的替代方法，这可能在基于原子的MW测量应用中发挥作用。
