: For efficient light conversion, the interacting waves must stay in phase. This is achieved by carefully orienting the crystal or controlling its temperature. Birefringence and Dispersion
are available to automate finding the best crystal length for devices like pulsed second-harmonic generators. AS-Photonics SNLO Functionality Overview The software is divided into two main categories: Crystal Properties: crystal nonlinear optics with snlo examples pdf
$$P_i = \epsilon_0 \chi_ij^(1) E_j + \epsilon_0 \chi_ijk^(2) E_j E_k + \epsilon_0 \chi_ijkl^(3) E_j E_k E_l + ...$$ : For efficient light conversion, the interacting waves