title: Observation of continuous-wave second-harmonic generation in semiconductor waveguide directional couplers.
abstract: We report the observation of continuous-wave second-harmonic generation in waveguide directional couplers. We employ a GaAs/AlGaAs system and observe four resonance peaks in a ~15nm spectral range, with a maximal conversion efficiency of 1.6%W(-1)cm(-2). This observation is theoretically explained by the coupled-mode theory. This new configuration has the potential to open a new range of applications for nonlinear frequency conversion.
authors.forename: Po
authors.initials: P
authors.lastname: Dong
authors.forename: Jeremy
authors.initials: J
authors.lastname: Upham
authors.forename: Aju
authors.initials: A
authors.lastname: Jugessur
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Kirk