OPTICAL DARK AND BRIGHT SPATIAL SOLITONS IN PHOTOREFRACTIVE MEDIA

We verify theoretically the existence of dark and bright spatial solit ons in photorefractive media with drift or photovoltaic mechanisms bas ed on a wave coupling process. We show that spatial solitons in a phot orefractive material with a drift dominant mechanism are independent o f the intensity of light. We also show that spatial solitons in a phot orefractive material with a photovoltaic mechanism are dependent on th e intensity of the incident light.