“Incoherent” generation of spatial gap solitons within one-dimensional photorefractive photonic lattices in lithium niobate

The effect of the formation of spatial gap solitons within one-dimensional optically induced photo-refractive photonic lattices in iron-doped lithium niobate is experimentally investigated. Mutually incoherent Bragg-matched beams with optical powers in the microwatt range from two different He-Ne lasers are used to generate immobile spatial gap solitons within the lattice with a spatial period of 15 μm.