Abstract
We observe the self-development of a light beam propagating along the bisector of two waves, one ordinary and the other extraordinary, that intersect inside a BaTiO3 sample at the plane that is normal to the optical axis of the crystal at the angle meeting the phase-matching condition for forward vectorial parametric mixing of three coplanar light beams. When the angle of intersection exceeds the phase-matching angle, a cone of extraordinary waves appears instead of only one beam. Both the geometry and the intensity behavior were shown to conform well to the predictions of the model in which the process is considered as forward parametric four-wave mixing.
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