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- S.J. Wagner, A. Al Muhairi, J. S. Aitchison, A. Helmy
- IEEE Journal of Quantum Electronics
- 2008

Second-harmonic generation in a quasi-phase matched waveguide produced using a domain-disordered GaAs-AlAs superlattice is modeled including the effects of group velocity mismatch, nonlinear refraction, two-photon absorption, and linear loss. The model predicts our experimentally observed second-harmonic powers within an order of magnitude. Self-phaseâ€¦ (More)

- S.J. Wagner, B.M. Holmes, Usman Younis, A. Helmy, D.C. Hutchings, J. S. Aitchison
- IEEE Photonics Technology Letters
- 2009

The optical Kerr effect was measured by observing self-phase modulation in GaAs-AlGaAs superlattice-core waveguides modified by ion-implantation quantum-well intermixing. The band-gap energy was shifted by 68 nm for an implantation dose of 0.5times10<sup>13</sup> cm<sup>-2</sup> and annealing temperature of 775degC. The Kerr effect was suppressed by up toâ€¦ (More)

- S.J. Wagner, B.M. Holmes, Usman Younis, A. Helmy, D.C. Hutchings, J. S. Aitchison
- LEOS 2008 - 21st Annual Meeting of the IEEEâ€¦
- 2008

Continuous wave second-harmonic generation was demonstrated in quasi-phase-matched GaAs/AlGaAs superlattice-core waveguides formed by periodic intermixing. Output second harmonic powers of 950 nW were recorded. Bistability was observed when tuning either the input power or wavelength.

- S.J. Wagner, A. Helmy, J. S. Aitchison, Usman Younis, B.M. Holmes, D.C. Hutchings
- 2008 Conference on Lasers and Electro-Optics andâ€¦
- 2008

Self-phase modulation was observed in GaAs/AlGaAs superlattice-core waveguides that were quantum well intermixed by ion implantation. The band gap was blue-shifted by 68 nm and the Kerr effect was suppressed by 67% after intermixing.

- S.J. Wagner, Joachim Meier, +4 authors D.C. Hutchings
- LEOS 2006 - 19th Annual Meeting of the IEEEâ€¦
- 2006

Cross-phase modulation (XPM) between orthogonally polarized modes is observed in GaAs/AlAs superlattice-core waveguides. With temporal walkoff accounted for, measured XPM coefficients (n<sub>X2</sub>) yield XPM-to-SPM ratios of 0.75 for TM and 0.43 for TE

- A. Al Muhairi, S.J. Wagner, J. S. Aitchison, A. Helmy
- 2008 Conference on Lasers and Electro-Optics andâ€¦
- 2008

Simulations show that group-velocity-mismatch and third-order effects reduce second harmonic generation efficiency by 23% and 33%, respectively, in GaAs/AlAs superlattice waveguide. Also, optimal waveguide lengths were found to be longer than the walkoff length.

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