title: Simulating the space-charge field formation in thermally poled optical fibers: a new two-rate model for hydrogenated cations.
abstract: In thermally poled optical fibers, the second-order nonlinearity has been observed to be distributed in a narrow layer more than 10 μm beneath the anode surface, a result that cannot be explained by current models. In this Letter, we propose a new model based on slow migration of H3O+and fast H+migration related to the H3O+concentration. The numerical simulation results show a narrow layer-shaped distribution of the induced second-order nonlinearity, which retains its magnitude and distribution profile in the migration process, and is in good agreement with the experimental observations.
authors.forename: Lin
authors.initials: L
authors.lastname: Huang
authors.forename: Honglin
authors.initials: H
authors.lastname: An
authors.forename: Guobin
authors.initials: G
authors.lastname: Ren
authors.forename: Simon
authors.initials: S
authors.lastname: Fleming