title: Probing electronic coherences by combined two- and one-photon excitation in atomic vapors.
abstract: Wave mixing in a three-level quantum system induced by two-photon resonant pump and one-photon resonant coupling at lower transition has been studied theoretically and experimentally. Resonantly enhanced difference-frequency generation efficiency was observed clearly dependent on the time delay and its sign between the femtosecond pump and probe. The role of the atomic coherences on the amplification without inversion during different sequences of interaction in a closed three-level system has been also stressed. These findings were confirmed experimentally in atomic potassium, where strong parametric amplification, induced by the pump delayed with respect to the probe, has been observed for the first time.
authors: Vilnius University, Laser Research Center, Vilnius 10222, Lithuania. eugenijus.gaizauskas@ff.vu.lt
authors: Eugenijus
authors: E
authors: Gaižauskas
authors: Dionysios
authors: D
authors: Pentaris
authors: Thomas
authors: T
authors: Efthimiopoulos
authors: Virgilijus
authors: V
authors: Vaičaitis