title: Supercontinuum generation with optical vortices.
abstract: We employ an optical vortex beam for the generation of femtosecond supercontinuum in a solid state medium. We demonstrate that the continuum generation process is initiated by the filamentation of the vortex, resulting in a spatially divergent continuum. Despite the strong self-focusing and the formation of multiple hot-spots along the vortex ring, the singularity is preserved in both the near- and far-fields.
authors: Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
authors: Dragomir N
authors: DN
authors: Neshev
authors: Alexander
authors: A
authors: Dreischuh
authors: Georgi
authors: G
authors: Maleshkov
authors: Marec
authors: M
authors: Samoc
authors: Yuri S
authors: YS
authors: Kivshar
mesh_terms: D004867:Equipment Design; D007834:Lasers; D008027:Light; D008859:Microscopy, Polarization; D017711:Nonlinear Dynamics; D055095:Optics and Photonics / Q000295:instrumentation* / Q000379:methods*; D012542:Scattering, Radiation