A theoretical model which can describe the dynamics of spatial bright discrete solitons in photovoltaic photorefractive media is suggested. Four different types of staggered solitons, symmetric odd and even, twisted and antisymmetric odd one are observed numerically and their behavior is investigated with respect to small transverse phase offsets. A first experimental observation of steering of such symmetric odd staggered solitons in lithium niobate waveguide arrays is presented.
We experimentally investigate propagation of light beams of visible range within waveguide arrays of one-dimensional photorefractive waveguides formed in the Y cut lithium niobate wafers. We demonstrate formation of bright staggered discrete spatial solitons within such an array at simulataneous π out fo phase excitation of two waveguide channels by cw light beam with wavelength of 514,4 nm and total power of 200 μW.