title: Quasi-phase-matched second-harmonic generation in a GaAs/AlAs superlattice waveguide by ion-implantation-induced intermixing.
abstract: We report type I second-harmonic generation by use of first-order quasi-phase matching in a GaAs/AlAs symmetric superlattice structure with femtosecond fundamental pulses at 1.55 microm. Periodic spatial modulation of the bulklike second-order susceptibility chi(zxy)(2) was achieved with quantum-well intermixing for which the group III vacancies were created by As+-ion implantation. A narrow second-harmonic bandwidth of approximately 0.9 nm (FWHM) with an average power of approximately 1.5 microW was detected, corresponding to an internal conversion efficiency of approximately 0.06%, which was considerably limited by the spectral bandwidth of the fundamental.
authors.affiliation: Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.
authors.forename: K
authors.initials: K
authors.lastname: Zeaiter
authors.forename: D C
authors.initials: DC
authors.lastname: Hutchings
authors.forename: R M
authors.initials: RM
authors.lastname: Gwilliam
authors.forename: K
authors.initials: K
authors.lastname: Moutzouris
authors.forename: S
authors.initials: S
authors.lastname: Venugopal Rao
authors.forename: M
authors.initials: M
authors.lastname: Ebrahimzadeh