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Optical spiral waves supported by competing nonlinearities

Physical Review A - Atomic, Molecular, and Optical Physics, ISSN: 1094-1622, Vol: 65, Issue: 4, Page: 4-null
2002
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Four-phase spiral waves are predicted to exist in a nonlinear optical cavity with competing quadratic (i.e., [Formula Presented] and cubic (i.e., [Formula Presented] nonlinearities. These spatial structures are found in the mean-field model of a doubly resonant type-II frequency-degenerate optical parametric oscillator with an intracavity [Formula Presented] isotropic medium. Degenerate four-wave mixing of signal and idler fields induced by the [Formula Presented] medium breaks the phase invariance of the down-conversion process, producing nonlinear phase locking with four possible phase states. A parametrically forced Ginzburg-Landau equation is derived to explain the existence of multiphase spiral waves. © 2002 The American Physical Society.

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