title: Kerr-nonlinearity optical parametric oscillation in an ultrahigh-Q toroid microcavity.
authors.affiliation: California Institute of Technology, Thomas J. Watson Laboratory of Applied Physics, Pasadena, CA 91125, USA.
authors.forename: T J
authors.initials: TJ
authors.lastname: Kippenberg
authors.forename: S M
authors.initials: SM
authors.lastname: Spillane
authors.forename: K J
authors.initials: KJ
authors.lastname: Vahala