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We observe and analyze formation, decay, and subsequent regeneration ofring-shaped clusters of (2+1)-dimensional spatial solitons (filaments) in amedium with the cubic-quintic (focusing-defocusing) self-interaction and strongdissipative nonlinearity. The cluster of filaments, that remains stable over~17.5 Rayleigh lengths, is produced by the azimuthal modulational instabilityfrom a parent ring-shaped beam with embedded vorticity l = 1. In the course ofstill longer propagation, the stability of the soliton cluster is lost underthe action of nonlinear losses. The annular cluster is then spontaneouslyregenerated due to power transfer from the reservoir provided by the unsplitpart of the parent vortex ring. A (secondary) interval of the robustpropagation of the regenerated cluster is identified. The experiments use alaser beam (at wavelength 800 nm), built of pulses with temporal duration 150fs, at the repetition rate of 1 kHz, propagating in a cell filled by liquidcarbon disulfide. Numerical calculations, based on a modified nonlinearSchr\"odinger equation which includes the cubic-quintic refractive terms andnonlinear losses, provide results in close agreement with the experimentalfindings.

Observation and analysis of creation, decay, and regeneration of annular soliton clusters in a lossy cubic-quintic optical medium