Interference-induced gain in the Autler-Townes doublet of a V-type atom ina cavity - art. no. 033818

We study the Autler-Townes spectrum of a V-type atom coupled to a single-mo de, frequency-tunable cavity field at finite temperature, with a pre-select ed polarization in the bad cavity limit, and show that, when the mean numbe r of thermal photons N>>1 and the excited sublevel splitting is very large (of the same order as the cavity linewidth), probe gain may occur at either sideband of the doublet, depending on the cavity frequency, due to cavity- induced quantum interference. It is also possible to choose the cavity detu ning so that one of the Autler-Townes sidebands vanishes.