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Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate

  • Autori: Stivala, S.; Busacca, A.; Pasquazi, A.; Oliveri, R.; Morandotti, R.; Assanto, G.
  • Anno di pubblicazione: 2010
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: Nonlinear optics; Harmonic generation and mixing
  • OA Link:


We observe second harmonic generation via random quasi-phase-matching in a 2.0 micron periodically poled, 1-cm-long, z-cut lithium tantalate. Away from resonance, the harmonic output profiles exhibit a characteristic pattern stemming from a stochastic domain distribution and a quadratic growth with the fundamental excitation, as well as a broadband spectral response. The results are in good agreement with a simple model and numerical simulations in the undepleted regime, assuming an anisotropic spread of the random nonlinear component.