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.
© 2013 Optical Society of America
Atomic and Molecular Physics
Original Manuscript: October 19, 2012
Manuscript Accepted: November 30, 2012
Published: January 8, 2013
Eugenijus Gaižauskas, Dionysios Pentaris, Thomas Efthimiopoulos, and Virgilijus Vaičaitis, "Probing electronic coherences by combined two- and one-photon excitation in atomic vapors," Opt. Lett. 38, 124-126 (2013)