Abstract
We consider and compare two-dimensional dissipative vortex solitons and their complexes in wide-aperture lasers and in exciton–polariton lasers; there is an incoherent pump and saturable absorption in both schemes presented. Our emphasis is on the study of the soliton’s internal structure. It can be revealed by the topology of energy fluxes and related energetic characteristics, because they are of primary importance for dissipative solitons representing the balance of energy input and output within the domains of field localization. For electromagnetic radiation in a nonlinear medium, it is difficult to separate energy between the field and the medium. The situation is simpler for paraxial beams and media with fast response (negligible dispersion), where we present the characterization of weak and strong soliton coupling based on the topology of spatial distributions of the Poynting vector and its divergence. Finally, we analyze the effect of nonresonant defocusing Kerr-like nonlinearity on vortex soliton existence and present different scenarios of soliton structural decay for sufficiently strong Kerr nonlinearity.
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