The nonlinear distributed optical system with rotation in 2-D feedback contour is considered. A particular case of rotational multi-petal waves is described by bifurcational periodic solutions in the form of power series expansion of a small parameter. Conditions of its stability are obtained. The finite-dimensionality of the studied system is defined in terms of the number of determining modes.
Alexander Vitalievic Razgulin,
"Rotational multipetal waves in optical system with 2D feedback", Proc. SPIE 2039, Chaos in Optics, (1 December 1993); doi: 10.1117/12.164778; https://doi.org/10.1117/12.164778