title: Four-wave parametric oscillation in sodium vapor by electromagnetically induced diffraction.
abstract: We have observed a novel type of parametric oscillation in sodium atomic vapor where four off-axis signal waves simultaneously build up under resonant and counterpropagating pump beams with elliptical beam profiles. The four waves, two of them Stokes shifted and the other two anti-Stokes shifted, have similar output powers of up to 10 mW with a conversion efficiency of 30% and are parametrically coupled by electromagnetically induced diffraction.
authors.affiliation: Japan Science and Technology Agency, Japan.
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Harada
authors.forename: Minoru
authors.initials: M
authors.lastname: Ogata
authors.forename: Masaharu
authors.initials: M
authors.lastname: Mitsunaga