We investigate theoretically and experimentally the operation of a nonlinear system,
feedback controlled photorefractive beam coupling. It is shown that the feedback equations …

We investigate the physics of a novel nonlinear system, feedback controlled photorefractive
beam coupling. Inertia of the electronic feedback is found to be an element crucial for …

We show that manipulation and selection of optical patterns is possible by detuning the
frequency of one of the two waves in counterpropagating photorefractive two-wave mixing …

We report on the experimental observation of the modulational instability of quasi-plane-
wave beams in the self-defocusing photorefractive crystal LiNbO 3: Fe. Our analysis shows …

We show that a certain phase feedback between output and input changes dramatically the
characteristics of photorefractive two-beam coupling. The diffraction efficiency of the …

We report on the experimental observation of the modulation instability of uniform beam and
frequency-doubling of interference fringes spatial frequency in self-defocusing …

A nonlinear theory is presented for the formation of hexagonal optical structures in a
photorefractive medium equipped with a feedback mirror. Oppositely directed beams in …

We report on the experimental observation of the modulation instability in self-defocusing
photorefractive LiNbO3: Fe crystal. Experimental results show that the modulation instability …

We examine, both theoretically and experimentally, photorefractive coupling in KNbO 3: Rb
with beams at several wavelengths in a dual grating achromatic arrangement. It is shown …

A theoretical analysis is presented of spontaneous pattern formation in a system consisting
of a photorefractive medium and a feedback mirror. A threshold condition for the pattern …