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Doubly resonant QPM AlGaAs microcavity for second-harmonic generation

We demonstrate for the first time second-harmonic generation (SHG) in a doubly resonant (fundamental and SH) semiconductor microcavity. In order to obtain such a double resonance, an original method is implemented for the design of the Bragg mirrors. The result we obtain is a system that does not present any apparent periodicity. Another originality of our approach is that the quasiphase-matching (QPM) is achieved by controlling the fundamental and SH phases at the reflection on the Bragg mirrors. We use an AlGaAs active medium and two nonperiodic dual wavelength mirrors. The Bragg mirrors are composed of AlGaAs-AlAs stacks whose thicknesses were optimized using an original algorithm.