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We describe the controlled observation of the nonequilibrium Ising-Blochtransition in a broad area nonlinear optical cavity, namely, a quasi-1D singlelongitudinal-mode photorefractive oscilator in a degenerate four-wave mixingconfiguration. Our experimental technique allows for the controlled injectionof the domain walls. We use cavity detuning as control parameter and find thatboth Ising and Bloch walls can exist for the same detuning values within acertain interval of detunings, i.e., the Ising-Bloch transition is hystereticin our case. A complex Ginzburg-Landau model is used for supporting theobservations.Comment: Three and 1/3 text pages and four figures. Replaced with resubmitted  version that now includes a theoretical approac

Controlled Observation of a Nonequilibrium Ising-Bloch Transition in a Nonlinear Optical Cavity