Microwave-Controlled Light-Pulse Propagation in a Driven A-Type Atomic System with Two-Folded Levels

摘要

The temporal and spatial dynamics of one weak probe laser pulse,propagating through a Λ-type atomicmedium with two-folded levels under the resonant excitation of one microwave driving field and one strong control field,is investigated in this paper.By numerically solving coupled Bloch-Maxwell equations,it is found that,in the absenceof the microwave driving field,the atomic medium is transparent to the probe pulse at line center,which propagatesover sufficiently long distances.By contrast,when the microwave driving field is applied,the probe pulse at line centercan be rapidly absorbed on propagation.This substantial reduction of probe transmittance caused by the microwavedriving field may lead to potential applications in designing a new kind of optical switching.