DIEET, University of Palermo, 90128 Palermo, Italy.
Opt Lett. 2010 Feb 1;35(3):363-5. doi: 10.1364/OL.35.000363.
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.
我们在 2µm 周期极化、1cm 长、z 切的钽酸锂中观察到通过随机准相位匹配的二次谐波产生。在离共振较远的情况下，谐波输出谱呈现出一种特征模式，源于随机畴分布和与基频激发的二次增长，以及宽带光谱响应。在未耗尽的情况下，这些结果与简单模型和数值模拟吻合较好，假设随机非线性成分的各向异性扩展。
