title: Dispersion of nonlinear refraction and two-photon absorption using a white-light continuum Z-scan.
abstract: We use a white-light continuum (WLC) Z-scan technique to measure the degenerate two-photon absorption spectrum and associated dispersion of the nonlinear refraction in ZnSe. The spectral components of the WLC source are separated by using a narrow band variable filter to minimize nondegenerate nonlinearities. We observe a change in sign of the ultrafast nonlinear refractive index around 0.7 of the bandgap energy as predicted by theory.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Balu
authors.forename: Joel
authors.initials: J
authors.lastname: Hales
authors.forename: David
authors.initials: D
authors.lastname: Hagan
authors.forename: Eric
authors.initials: E
authors.lastname: Van Stryland