Incoherently coupled photorefractive spatial solitons supported by pyroelectric effects

Abstract

A theory for predicting the existence of incoherently coupled spatial soliton pairs due to solely the pyroelectric effect in nonphotovoltaic–photorefractive crystals with an appreciable pyroelectric coefficient is presented. The bright–bright, dark–dark, gray–gray, and bright–dark soliton pairs are shown to exist. These soliton pairs are established if the incident beams propagate collinearly and have the same polarization and wavelength but are mutually incoherent. The magnitude of temperature change of the crystal and the incident beams’ intensity profoundly affect these soliton pairs.