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Proceedings Paper

Optical pattern formation far beyond threshold
Author(s): Thorston Ackemann; E. Grosse Westhoff; M. Pesch; D. Rudolph; Wulfhard K. Lange
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Paper Abstract

Optical pattern formation is studied far beyond threshold in a single-mirror feedback scheme using sodium vapor as the nonlinear medium. Patterns with twelve fundamental wave vectors arise form hexagons in a secondary bifurcation. Besides irregular patterns, quasi patterns and superlattices are obtained. Even after a tertiary bifurcation the patterns remain stationary. Fourier filtering experiments show that the harmonics of the fundamental wave vectors are essential for the stability of the secondary and tertiary patterns. A novel Fourier filtering technique is used for a measurement of the neutral stability curve and proves experimentally the existence of multiple instability regions existing due to the periodicity of the Talbot effect.

Paper Details

Date Published: 24 July 2002
PDF: 12 pages
Proc. SPIE 4751, ICONO 2001: Nonlinear Optical Phenomena and Nonlinear Dynamics of Optical Systems, (24 July 2002); doi: 10.1117/12.475935
Show Author Affiliations
Thorston Ackemann, Westfaelische Wilhelms-Univ. Muenster (Germany)
E. Grosse Westhoff, Westfalische Wilhelms-Univ. Muenster (Germany)
M. Pesch, Westfalische Wilhelms-Univ. Muenster (Germany)
D. Rudolph, Westfalische Wilhelms-Univ. Muenster (Germany)
Wulfhard K. Lange, Westfaelische Wilhelms-Univ. Muenster (Germany)

Published in SPIE Proceedings Vol. 4751:
ICONO 2001: Nonlinear Optical Phenomena and Nonlinear Dynamics of Optical Systems

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