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14 results on '"Lange, Wulfhard"'

2. Properties of feedback solitons in a single-mirror experiment

Author

Schapers, Burkhard, Ackemann, Thorsten, and Lange, Wulfhard

Subjects
Cavity resonators -- Research, Solitons -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Localized states (LS) in a single-mirror feedback system that uses sodium vapor as the nonlinear medium are investigated and reported.

Published
2003

5. Secondary bifurcations of hexagonal patterns in a nonlinear optical system: alkali metal vapor in a single-mirror arrangement

Author

Gomila, Damià, Ackemann, Thorsten, Grosse Westhoff, Edgar, Colet, Pere, and Lange, Wulfhard

Subjects
Diffraction, education.field_of_study, Secondary bifurcations, Zeeman effect, Materials science, Nonlinear optics, business.industry, Buffer gas, Population, Phase (waves), symbols.namesake, Transverse plane, Optics, symbols, business, education, Patterns, Beam (structure)
Abstract

12 pages.-- PACS nrs.: 89.75.Kd, 42.65.Sf, 47.54.+r, 47.20.Ky., Secondary bifurcations of hexagonal patterns are analyzed in a model of a single-mirror arrangement with an alkali metal vapor as the nonlinear medium. A stability analysis of the hexagonal structures is performed numerically. Depending on the wavenumber of the hexagons different instabilities are predicted. Some of them take place at a finite wavenumber and result in the formation of structures with twelve spatial modes. These structures are compared with those observed experimentally., The authors acknowledge financial support from the European Science Foundation (PHASE network). D.G. and P.C. acknowledge financial support from MCyT (Spain, projects "Acciones Integradas" Grant Nos. HA98-29, PB97-0141-C02-02, BFM2001-0341-C02-01, and BFM2000-1108). E.G.W., T.A. and W.L. acknowledge financial support by the Deutsche Akademische Austauschdienst (Acciones Integradas) and by the Deutsche Forschungsgemeinschaft., http://dx.doi.org/10.1103/PhysRevE.69.036205

Published
2004

6. Two-dimensional front dynamics and spatial solitons in a nonlinear optical system

Author

Pesch, M., Lange, Wulfhard, Gomila, Damià, Ackemann, Thorsten, Firth, William J., Oppo, Gian-Luca, Pesch, M., Lange, Wulfhard, Gomila, Damià, Ackemann, Thorsten, Firth, William J., and Oppo, Gian-Luca

Abstract

Two-dimensional fronts and coarsening dynamics with a t^1/2 power law are analyzed experimentally and theoretically in a nonlinear optical system of a sodium vapor cell with single-mirror feedback. Modifications of the t^1/2 power law are observed in the vicinity of a modulational instability leading to the formation of spatial solitons of different sizes. The experimental and numerical observations give direct evidence for the locking of fronts as the mechanism of soliton formation. A phenomenological equation for the dynamics of the radius of circular domains explains the observed behavior.

Published
2007

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