Supercontinuum generation with optical vortices.
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.
Neshev
Dragomir N
DN
Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
Dreischuh
Alexander
A
Maleshkov
Georgi
G
Samoc
Marec
M
Kivshar
Yuri S
YS
D004867:Equipment Design; D007834:Lasers; D008027:Light; D008859:Microscopy, Polarization; D017711:Nonlinear Dynamics; D055095:Optics and Photonics / Q000295:instrumentation* / Q000379:methods*; D012542:Scattering, Radiation