@article{GSH2008, abstract = {We investigate the existence and linear stability of coupled vortex solitons supported by cascaded four-wave mixing in a Raman active medium excited away from the resonance. We present a detailed analysis for the two-and three-component vortex solitons and demonstrate the formation of stable and unstable vortex solitons, and associated spatiotemporal helical beams, under the conditions of the simultaneous frequency and vortex comb generation.}, author = {Gorbach, A V and Skryabin, D V and Harvey, C N}, doi = {10.1103/PhysRevA.77.063810}, issn = {1050-2947}, journal = {PHYSICAL REVIEW A}, month = {jun}, number = {6}, title = {{Vortex solitons in an off-resonant Raman medium}}, volume = {77}, year = {2008} }