Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate.
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.
Stivala
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DIEET, University of Palermo, 90128 Palermo, Italy.
Busacca
A C
AC
Pasquazi
A
A
Oliveri
R L
RL
Morandotti
R
R
Assanto
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G