New time-dependent photorefractive three-dimensional model : application to self-trapped beam with large bending
Résumé
We propose a powerful method to numerically solve the propagation of light in photorefractive medium in presence of both applied field and photogalvanic nonlinearity. This time dependent full three-dimensional model is successfully applied to explain large self-bending of soliton-like beam observed in biased undoped lithium niobate crystals. It reveals that charge saturation is at the origin of beam bending. The numerical results give deep insight of the formation dynamics in agreement with experiments and depict the trajectory of the induced waveguide inside the crystal.