title: Focus issue introduction: nonlinear optics.
abstract: It is now fifty years since the original observation of second harmonic generation ushered in the field of nonlinear optics, close on the heels of the invention of the laser. This feature issue celebrates this anniversary with papers that span the range from new nonlinear optical materials, through the increasingly novel methods that have been developed for phase matching, to emerging areas such as nonlinear metamaterials and plasmonic enhancement of optical properties. It is clear that the next fifty years of nonlinear optics will witness a proliferation of new applications with increasing technological impact.
authors: Institut Néel CNRS Université Joseph Fourier, 38042 Grenoble Cedex 9, France.
authors: Benoît
authors: B
authors: Boulanger
authors: Steven T
authors: ST
authors: Cundiff
authors: Daniel J
authors: DJ
authors: Gauthier
authors: Magnus
authors: M
authors: Karlsson
authors: Yan-Qing
authors: YQ
authors: Lu
authors: Robert A
authors: RA
authors: Norwood
authors: Dmitry
authors: D
authors: Skryabin
authors: Takunori
authors: T
authors: Taira