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Opt Lett. 2010 Feb 1;35(3):363-5. doi: 10.1364/OL.35.000363.

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

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DIEET, University of Palermo, 90128 Palermo, Italy.


We observe second harmonic generation via random quasi-phase-matching in a 2.0 mum 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.

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