Quasi-phase matched second-harmonic generation in an AlxGa1−xAs asymmetric quantum-well waveguide using ion-implantation-enhanced intermixing

• Published in: Applied physics letters Vol. 77; no. 26; pp. 4247 - 4249
• Main Authors: Bouchard, Jean-Pierre, Têtu, M., Janz, S., Xu, D.-X., Wasilewski, Z. R., Piva, P., Akano, U. G., Mitchell, I. V.
• Format: Journal Article
• Language: English
• Published: 25-12-2000
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.1335545

Quasi-phase matched second-harmonic generation in the copropagating geometry is demonstrated in an asymmetric quantum-well waveguide. Modulation of the nonlinear susceptibility along the waveguide was achieved using a patterned quantum-well intermixing process. Photoluminescence measurements of the quantum-well bandedges indicate that a grating of alternating regions of intermixed and as-grown asymmetric quantum wells was produced for periods between 2 and 12 μm. The variation of the second-harmonic light intensity generated by guided incident light between λ=1480 and 1600 nm was measured. The resulting second-harmonic spectra show sharp quasi-phase matching resonances for grating periods near 3 μm, demonstrating that a periodic modulation of the quantum-well nonlinear susceptibility was produced.