We demonstrate enhanced optical parametric gains occurring at the edge of periodically poled LiNbO₃ (PPLN) regions. Experiments performed in MgO-doped PPLN samples, pumped at 532 nm with parametric signal outputs around 800 nm and 1550 nm, exhibit good agreement with numerical simulations of the nonlinear wave dynamics in the system, based on the assumption of an average refractive index increase Δn = 5.3×10⁻⁵ in the PPLN region. Excitation in proximity to the PPLN edge with a pump power of 8.1 mW results in a 3.6-fold output power increase with respect to parametric generation inside the PPLN area.

中文翻译：

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周期性极化的LiNbO3中的边缘增强光学参数生成。

我们证明增强的光学参数增益发生在周期性极化的LiNbO ₃（PPLN）区域的边缘。基于平均折射率增加Δn的假设，在掺有MgO的PPLN样品中进行的实验在532 nm下泵浦，参数信号输出在800 nm和1550 nm附近，与系统中非线性波动力学的数值模拟显示出很好的一致性。在PPLN区域中＝ 5.3×10 ^-5。相对于PPLN区域内部的参数生成，以8.1 mW的泵浦功率激励靠近PPLN边缘的结果导致输出功率增加3.6倍。