Theory of photorefractive resonance for localized beams in two-carrier photorefractive systems

The theory of photorefractive resonance for localized beams in two-carrier photorefractive systems

Counterpropagating beams in biased photorefractive crystals: anisotropic theory.

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...

Diffusion-trapped Airy beams in photorefractive media.

We report the first experimental observation of self-trapped Airy beams in a nonlinear medium. As opposed to screening or photovoltaic spatial solitons, this new class of self-localized beams owes its existence to carrier diffusion effects. The asymmetric action of two-wave mixing supports the asymmetric intensity profile of the Airy states, with a balance that is independent of the beam intens...

Developments in Photorefractive Two-beam Coupling Systems

Date_______________________ The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards fo scholarly work in the above mentioned discipline. Photorefractive systems hold the promise for improving the performance of photonic signal processing applications. This thesis describes several developments pert...

Counterpropagating self-trapped beams in photorefractive crystals

A time-dependent model for the formation of self-trapped optical beams in photorefractive media by counterpropagating laser beams is analysed. It is shown that dynamically the beams may form stable steady-state structures or display periodic and irregular temporal behaviour. Steady-state solutions of non-uniform cross section are found, representing a general class of self-trapped waveguides, t...