Abstract
Abstract The nucleation of a pair of vortices in the field of a boundary dominated confocal photorefractive phase-conjugate resonator is studied in detail. A phase instability is seen to precede the nucleation which occurs when the phase step reaches a threshold of π. The validity of a scenario based on the competition of a few modes is verified experimentally using a multichannel optical correlator equipped with matched filters designed to identify the modes presumed by the model.
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