耦合场线宽:抑制电磁诱导吸收

Coupling field linewidth: inhibiting electromagnetically induced absorption

原子相干对吸收的相长干涉导致电磁诱导吸收 ,这是一类新的相干效应 .以三个电偶极跃迁构成N型链 ,中间跃迁作为探测跃迁的四能级系统为例 ,揭示耦合场线宽抑制电磁诱导吸收的强度 .这并非与电磁诱导透明系统中耦合场线宽产生或者增强吸收的情形相矛盾 。

Constructive interference of atomic coherence leads to electromagnetically induced absorption,which is a new kind of coherent effects. In this paper we reveal that the coupling field linewidth inhibits electromagnetically induced absorption,by employing a four_level system in which three transitions are in N configuration and the middle one serves as a probe transition. This result is not in contradiction to the case of electromagnetically induced transparency where the coupling field linewidth gives rise to or increases absorption,and the linewidth still suppresses the coherence of systems.