We have developed an all-epitaxial technique employing GaAs/Ge/GaAs polar-on-nonpolar epitazy for fabrication of orientation-patterned semiconductor templates and used it in combination with epitaxial regrowth to produce orientation-patterned nonlinear optical waveguide devices. We report here the first second harmonic generation experiments performed in these AlGaAs waveguides using a tunable 1.5 ┬Ám optical parametric oscillator.

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