title: Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation.
abstract: We investigate the dispersion properties of ridge Bragg-reflection waveguides to deduce their phasematching characteristics. These are crucial for exploiting them as sources of parametric down-conversion (PDC). In order to estimate the phasematching bandwidth we first determine the group refractive indices of the interacting modes via Fabry-Perot experiments in two distant wavelength regions. Second, by measuring the spectra of the emitted PDC photons, we gain access to their group index dispersion. Our results offer a simple approach for determining the PDC process parameters in the spectral domain, and provide important feedback for designing such sources, especially in the broadband case.
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.
authors.forename: K
authors.initials: K
authors.lastname: Laiho
authors.forename: B
authors.initials: B
authors.lastname: Pressl
authors.forename: A
authors.initials: A
authors.lastname: Schlager
authors.forename: H
authors.initials: H
authors.lastname: Suchomel
authors.forename: M
authors.initials: M
authors.lastname: Kamp
authors.forename: S
authors.initials: S
authors.lastname: Höfling
authors.forename: C
authors.initials: C
authors.lastname: Schneider
authors.forename: G
authors.initials: G
authors.lastname: Weihs