title: Resonant two-photon absorption and electromagnetically induced transparency in open ladder-type atomic system.
abstract: We have experimentally and theoretically studied resonant two-photon absorption (TPA) and electromagnetically induced transparency (EIT) in the open ladder-type atomic system of the 5S(1/2) (F = 1)-5P(3/2) (F' = 0, 1, 2)-5D(5/2) (F″ = 1, 2, 3) transitions in (87)Rb atoms. As the coupling laser intensity was increased, the resonant TPA was transformed to EIT for the 5S(1/2) (F = 1)-5P(3/2) (F' = 2)-5D(5/2) (F″ = 3) transition. The transformation of resonant TPA into EIT was numerically calculated for various coupling laser intensities, considering all the degenerate magnetic sublevels of the 5S(1/2)-5P(3/2)-5D(5/2) transition. From the numerical results, the crossover from TPA to EIT could be understood by the decomposition of the spectrum into an EIT component owing to the pure two-photon coherence and a TPA component caused by the mixed term.
authors.affiliation: Department of Physics, Pusan National University, Geumjeong-Gu, Busan 609-735, South Korea. hsmoon@pusan.ac.kr
authors.forename: Han Seb
authors.initials: HS
authors.lastname: Moon
authors.forename: Heung-Ryoul
authors.initials: HR
authors.lastname: Noh
mesh_terms: D000042:Absorption; D003198:Computer Simulation; D004574:Electromagnetic Fields; D008422:Materials Testing; D008956:Models, Chemical; D017785:Photons; D012031:Refractometry / Q000379:methods*