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Diffractive patterns in a 2D feedback system: interballoon mode interactions

New types of transversal interactions in a nonlinear interferometer with Kerr slice and two dimensional feedback are analyzed. We show that interactions between the most unstable modes have wavevectors belonging to different mode instability bands (interballoon interactions) cause the formation of new types of patterns. Mode amplitude equations for these patterns are obtained. Analysis of amplitude equations is confirmed by numerical simulation.