We show analytically and numerically that the refractive-index gratings produced by the
photorefractive effect need not be of the same periodicity as the driving light intensity. Even …

We show that the dielectric grating induced by an external probe in a photorefractive crystal
with the period of the external probe can be unstable against period multiplication. We …

Using a new experimental geometry, we have proved for the first time that the generation of
spatial subharmonic gratings in photorefractive crystals is not dependent on optical …

Using the so-called ac field technique, we investigate experimentally the influence of optical
beam coupling on the generation of subharmonic gratings in a photorefractive sillenite …

The nonlinear differential equations describing the response of photorefractive material to a
moving sinusoidal intensity pattern that permits large modulation depth are solved by a …

The theory of grating oscillations in photorefractive materials is developed in the linear and
nonlinear approximations for the drift mechanism of holographic recording. The resonance …

The main results of the theory of spatial subharmonics in photorefractive crystals are
summarized. The theory shows that Kukhtarev's equations for the photorefractive response …

We present an analysis of what is called parametric oscillation in photorefractive media. It is
shown theoretically that when a running grating and a constant electric field are applied to a …

It is shown that spatial gratings in photorefractive crystals, induced by the standing
interference pattern of two coherent waves and an external alternating electric field, may be …

We extend the standard model of four-wave mixing in photorefractive crystals to the case
where the Bragg-condition is broken by a slight departure from degeneracy. Our analytical …