Optical pattern formation far beyond threshold

T. Ackemann, E. Große Westhoff, M. Pesch, D. Rudolph, W. Lange

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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 from hexagons in a secondary bifurcation. Besides irregular patterns, quasipatterns 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.

Original languageEnglish
Pages (from-to)370-381
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 24 Jul 2002


  • fourier filtering
  • optical pattern formation
  • quasipatterns
  • secondary instabilities
  • superlattices


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