title: Three-dimensional characterization of the effective second-order nonlinearity in periodically poled crystals.
abstract: A novel technique for characterization of the second-order nonlinearity in nonlinear crystals is presented. It utilizes group-velocity walk-off between femtosecond pulses in type II SHG to achieve three-dimensional resolution of the nonlinearity. The longitudinal and transversal spatial resolution can be set independently. The technique is especially useful for characterizing quasi-phase-matched nonlinear crystals, and it is demonstrated in potassium titanyl phosphate.
authors.affiliation: Department of Physics, Royal Institute of Technology, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden. sh@laserphysics.kth.se
authors.forename: Stefan J
authors.initials: SJ
authors.lastname: Holmgren
authors.forename: Valdas
authors.initials: V
authors.lastname: Pasiskevicius
authors.forename: Shunhua
authors.initials: S
authors.lastname: Wang
authors.forename: Fredrik
authors.initials: F
authors.lastname: Laurell