Amplitude and phase control of transient absorption and dispersion in a microwave-driven atomic system

Abstract

In a V-type three-level atomic system driven by a coherent field and a microwave field, we exploit the fact that the transient absorption and dispersion properties of the probe laser can be dramatically modified by controlling the relative phase of the applied fields. With proper values of the relative phase, the transient absorption can be eliminated, and the high refractive index without absorption can be achieved. It is shown that amplitude of the microwave field is also important factor that can result in different gain and dispersion behaviors of the probe.