Ensuring the fundamental and generated waves stay in phase.
SNLO will output the precise and Phi (φ) angles, the effective nonlinearity ( deffd sub e f f end-sub ), and the walk-off angle. Example B: Modeling Pulse Propagation (Module: 2D-Mix-SP) crystal nonlinear optics with snlo examples pdf
Accounting for the spatial separation of beams in birefringent crystals. Ensuring the fundamental and generated waves stay in phase