Quasi-phase-matching second harmonic generation caused by pendulum effect in photonic crystals

Second harmonic generation (SHG) in the Laue scheme of the dynamical Bragg diffraction in 1D photonic crystal (PhC) is studied. The experiments are performed for partially annealed porous-silicon PhC containing 250 periods of the structure. Our measurements confirm phase-matched SHG under the Bragg condition. Possible types of phase- and quasi-phase-matching realized in the studied PhC are discussed.