Wilbrandt, SteffenSteffenWilbrandtStenzel, OlafOlafStenzel2025-08-132025-08-132025https://publica.fraunhofer.de/handle/publica/49049410.3390/modelling60200482-s2.0-105009032972We present a practical numerical model for calculating transmittance and reflectance of multilayer antireflection coatings taking third-order optical nonlinearities into account. Thereby, the impact of different types of discretization of the complex refractive index profile on the predicted system performance is investigated. Additionally, aspects of parallelism of the calculations are discussed. It is shown that the inclusion of nonlinearity is essential when large laser intensities are incident to the coating. The developed method is applied for the design of different antireflective coatings matching various types of targets.enfalseantireflection coatingscoating designnonlinear opticthird-order optical nonlinearitytwo-photon absorptionjournal article