We analyze multisoliton complexes and their dynamics in Kerr-like nonlinear media. The field in each of M incoherently interacting components is calculated using an integrable set of coupled nonlinear Schrödinger equations. We obtain a general N-soliton solution describing propagation of multisoliton complexes and their collisions. The evolution of such higher-order soliton beams is determined ...

We report the observation of planar Y-junction waveguide splitters that are due to the bulk photovoltaic effect. The junctions are generated by multiple dark-soliton propagation in LiNbO(3) by use of low power levels (20 mW) and average intensities of 10 W/cm(2) at 488 nm. The junctions persist in the dark and can be used to divide input beams of less photorefractive sensitivity. We describe so...

We present both experimental and theoretical results on discrete solitons in two-dimensional optically-induced photonic lattices in a variety of settings, including fundamental discrete solitons, vector-like discrete solitons, discrete dipole solitons, and discrete soliton trains. In each case, a clear transition from two-dimensional discrete diffraction to discrete trapping is demonstrated wit...

We address the impact of the asymmetric nonlocal diffusion nonlinearity of gap solitons supported by photorefractive crystals with an imprinted optical lattice. We reveal how the asymmetric nonlocal response alters the domains of existence and the stability of solitons originating from different gaps. We find that in such media gap solitons cease to exist above a threshold of the nonlocality de...

We investigated 2k-grating-assisted self-pumped phase conjugation in photorefractive Ce:BaTiO3 crystals. The phase-conjugation process involves a combination of four-wave mixing and stimulated photorefractive backscattering. An approximation involving separate interaction regions is used to theoretically calculate the reflectivity of phase conjugation as a function of the coupling strength of f...

We formulate an anisotropic nonlocal theory of the space charge field induced by the coherent counterpropagating beams in biased photorefractive crystals. We establish that the competition between the drift and diffusion terms has to be taken into account when the crystal ĉ axis is tilted with respect to the propagation direction of the beams. We demonstrate that this configuration combines the...

Abstract This article presents a critical look at the standard theory of bright and dark photorefractive screening solitons. We pay attention to commonly overlooked fact inconsistency in context accordance soliton solution with microscopic band transport models. Taking into account material equations for semi-insulating semiconductor (SI-GaAs) including nonlinear hot electrons, simple different...

Abstract We investigate and formulate a detailed theory studying the temperature effects on bright-dark optical spatial soliton pair in novel photorefractive crystals having both nonlinearities i.e., quadratic linear electro-optic effects. The coupled modified Nonlinear Schrodinger (NLS) equations is solved exactly to obtain analytical solutions for components. There are few physical factors wh...

We study the existence and stability of multi-component spatial optical solitons in anisotropic nonlocal photorefractive media. For the case of three components, we find numerically the whole family of composite solitons with two perpendicular dipole components, and show their stability for a wide range of parameters. We confirm our theoretical results by an experimental observation of these no...