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Dynamics of drifting patterns in a tilted feedback system

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Abstract

The dynamics of patterns emerging from a photorefractive two-wave mixing geometry, where tilted single feedback mirror gives rise to an advection-like effect, is studied experimentally. The nonlocal coupling (introduced by the tilting angle) between the two counterpropagating beams, the strength of the nonlocal response of the photorefractive medium, cause the existence of: (i) the seeding of new pattern geometry, (ii) an inversion of pattern transverse phase velocity, (iii) a bifurcation from convective to absolute instabilities.

© 2010 Optical Society of America

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