真空场诱导的量子相干性对Λ-型三能级原子的探测光的吸收和散射的影响

Effect of Vacuum-induced Interference on Probe Absorption and Dispersion of a Λ-type Three-level Atom

用数值方法考察了在真空场诱导的相干性存在的条件下,探测路径和耦合路径上的非相干粒子数抽运对探测光的吸收和散射的影响.在耦合路径上的抽运抑制了探测光的透明.当耦合路径上的衰变率大于探测路径上的衰变率时,探测路径上的抽运导致了非逆转增益现象的产生.当真空场诱导的相干性存在时,增益图像被倒置了.当耦合路径上的衰变率等于探测路径上的衰变率时,仅当真空场诱导的相干性存在时才有增益现象.

We discuss the effects of the incoherent pumping in both probe and coupling channels on the absorption and dispersion of the probe laser with quantum interference. The incoherent population pumping in the coupling channel decreases the probe transparency. When decay rate in the coupling channel is greater than that in the probe channel, the incoherent population pumping in the probe channel can create the gain without inversion. The probe absorption pattern is upsidedown if the interference is present. When the decay rates in the probe and channels are equal, the incoherent pumping in the probe channel doesn't create the gain until the existence of the interference.