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We report the transverse instability of laser beams due to counterpropagation in
photorefractive KNbO_3. Hexagonal unstable emission emerges around two …

In this letter, we present the results of two-wave mixing experiments performed with several
BaTiO:> crystals in the temperature range between 20 and 125" C. Earlier publications by …

We consider propagation of a light beam in photorefractive media in the framework of a
three-dimensional model. We formulate equations governing three-dimensional distribution …

Optical spatial solitons1 in photorefractive crystals2 have shown potential to form graded
index waveguides which can guide other beams. 3, 4 A soliton forms when a photoinduced …

We study theoretically and experimentally the modulational instability of broad optical
beams in photorefractive nonlinear media. The angular dependence of the growth rate of …

We present theory and experiments to show that the efficiency of four-wave mixing in
photorefractive materials can be enhanced by use of optical waves of slightly different …

In this Letter we report on the observation of a multicolored ring, or rainbow, which emerges
from a photorefractive crystal when coherent light from an argon-ion laser is passed through …

We present and experimentally demonstrate a new method for enhancing the signal-to-
background ratio of two-wave mixing in photorefractive crystals. The method uses a mutually …

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