title: Quantum-well intermixing for the control of second-order nonlinear effects in AlGaAs multiple-quantum-well waveguides.
abstract: We present experimental evidence to demonstrate the feasibility of a promising new quasi-phase-matching technique in AlGaAs multiple-quantum-well waveguides. Non-phase-matched second-harmonic-generation measurements indicate that, for sub-half-bandgap excitation near 1.5 microm , quantum-well intermixing by impurity-free vacancy disordering results in a reduction of the nonlinear susceptibility chi((2))(zxy) (~340 pm/V) by 17%. Relatively low intermixed waveguide losses, and the high spatial resolution of the impurity-free vacancy disordering process, suggest that periodic intermixing along the direction of propagation should lead to useful frequency-conversion efficiencies.
authors.forename: M W
authors.initials: MW
authors.lastname: Street
authors.forename: N D
authors.initials: ND
authors.lastname: Whitbread
authors.forename: D C
authors.initials: DC
authors.lastname: Hutchings
authors.forename: J M
authors.initials: JM
authors.lastname: Arnold
authors.forename: J H
authors.initials: JH
authors.lastname: Marsh
authors.forename: J S
authors.initials: JS
authors.lastname: Aitchison
authors.forename: G T
authors.initials: GT
authors.lastname: Kennedy
authors.forename: W
authors.initials: W
authors.lastname: Sibbett