$$P_i = \epsilon_0 \chi_ij^(1) E_j + \epsilon_0 \chi_ijk^(2) E_j E_k + \epsilon_0 \chi_ijkl^(3) E_j E_k E_l + ...$$
The core resource for crystal nonlinear optics modeling using SNLO is Arlee Smith's . This text bridges the gap between theoretical nonlinear optics and practical device design, featuring over 100 modeling examples to illustrate physical concepts like dispersion, birefringence, and walk-off. Core Content for Crystal Nonlinear Optics crystal nonlinear optics with snlo examples pdf
Determine how much the "extraordinary" beam drifts away from the "ordinary" beam. SNLO Module: Biref . $$P_i = \epsilon_0 \chi_ij^(1) E_j + \epsilon_0 \chi_ijk^(2)