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We demonstrate experimentally that a broad area laser-like optical oscillator(a nondegenerate photorefractive oscillator) with structured injected signaldisplays two-phase patterns. The technique (G. J. de Valc\'arcel and K.Staliunas, Phys. Rev. Lett. (105), 054101 (2010)) consists in spatiallymodulating the injection, so that its phase alternates periodically between twoopposite values, i.e. differing by pi

Experimental demonstration of phase bistability in a broad area optical oscillator with injected signal