Abstract
The dynamics of a resonator using an externally pumped photorefractive phase-conjugate mirror is studied experimentally as a function of the phase mismatch introduced by an angular tilt of the pump beam. At the lowest Fresnel number allowing transverse structures ( F∼2.5), it is observed that spatially inhomogenous patterns are time dependent, periodic in this case, with a diverging period as phase matching is approached. The transverse beam pattern is analyzed using a singular value decomposition revealing two significant eigenmodes oscillating in phase quadrature.
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