The cascaded second-order nonlinear interactions of Sum-frequency and Difference-frequency Generation (SFG+DFG) in periodically poled lithium niobate waveguide were presented.

• 摘要通过理论分析和数值模拟研究了在双脉冲泵浦情况下的级联和频与差频的二阶非线性效应，探讨了走离效应对波长转换的影响。