TY - JOUR
T1 - Multiple-pattern stability in a photorefractive feedback system
AU - Schwab, M.
AU - Denz, C.
AU - Saffman, M.
PY - 1999
Y1 - 1999
N2 - We report on the observation of a multiple-pattern stability region in a photorefractive single-feedback system. Whereas hexagonal patterns are predominant for feedback with positive diffraction length we show that a variety of stable non-hexagonal patterns are generated for certain negative diffraction lengths. For the same values of the control parameters square, rectangular, or squeezed hexagonal patterns are found alternating in time. Besides these pure states, we found a number of different mixed-pattern states. We review the linear stability analysis for this system and show that the special shape of the threshold curves in the investigated parameter region gives a first explanation for the occurrence of a multiple-pattern region.
AB - We report on the observation of a multiple-pattern stability region in a photorefractive single-feedback system. Whereas hexagonal patterns are predominant for feedback with positive diffraction length we show that a variety of stable non-hexagonal patterns are generated for certain negative diffraction lengths. For the same values of the control parameters square, rectangular, or squeezed hexagonal patterns are found alternating in time. Besides these pure states, we found a number of different mixed-pattern states. We review the linear stability analysis for this system and show that the special shape of the threshold curves in the investigated parameter region gives a first explanation for the occurrence of a multiple-pattern region.
KW - Optik og sensorsystemer
U2 - 10.1007/s003400050831
DO - 10.1007/s003400050831
M3 - Journal article
SN - 0946-2171
VL - 69
SP - 429
EP - 433
JO - Applied Physics B-Lasers and Optics
JF - Applied Physics B-Lasers and Optics
ER -