Abstract
It is shown that it is possible to increase dramatically the efficiency of stationary four-wave mixing in cubic photorefractive crystals of the sillenite family. In order to do this one has to use a holographic arrangement of the cubic crystal where the same volume phase hologram has opposite contrasts for orthogonally polarized light waves traversing the sample in opposite directions. In combination with a new efficient nonstationary mechanism of shifted hologram formation, this arrangement can enable phase conjugation of amplified waves and stationary selfoscillation without an external resonator cavity.
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