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Open Access item Polarization patterns and vectorial defects in type-II optical parametric oscillators

Authors:Santagiustina, Marco
Hernández-García, Emilio
San Miguel, Maxi
Scroggie, Andrew J.
Oppo, Gian-Luca
Keywords:[PACS] Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics
Issue Date:13-Feb-2003
Publisher:American Physical Society
Citation:Physical Review E 65(3): 036610 (2002)
Abstract:Previous studies of lasers and nonlinear resonators have revealed that the polarization degree of freedom allows for the formation of polarization patterns and novel localized structures, such as vectorial defects. Type- II optical parametric oscillators are characterized by the fact that the down-converted beams are emitted in orthogonal polarizations. In this paper we show the results of the study of pattern and defect formation and dynamics in a type-II degenerate optical parametric oscillator, for which the pump field is not resonated in the cavity. We find that traveling waves are the predominant solutions and that the defects are vectorial dislocations that appear at the boundaries of the regions where traveling waves of different phase or wave-vector orientation are formed. A dislocation is defined by two topological charges, one associated with the phase and another with the wave-vector orientation. We also show how to stabilize a single defect in a realistic experimental situation. The effects of phase mismatch of nonlinear interaction are finally considered.
Description:14 pages, 15 figures, 2 appendices.-- PACS nr.: 42.65.Sf.-- ArXiv pre-print available at: http://arxiv.org/abs/physics/0111023
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevE.65.036610
URI:http://hdl.handle.net/10261/14844
ISSN:1539-3755
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