Cascaded generation of multiply charged optical vortices and spatiotemporal helical beams in a Raman medium

Abstract

Using an example of a Raman active medium we describe how a common nonlinear process of four-wave mixing can be used to induce strong coupling between the spatial and temporal degrees of freedom in optical waves. This coupling produces several unexpected effects. Amongst those are cascaded excitation of multiply charged optical vortices, spatial focusing in a nonlinearly defocusing medium and generation of helically shaped spatio-temporal optical solitons.

arXiv comment5 pages, 4 figures, some revisions of introductory part, corrected references

References in corpus (5)

• Management of the Angular Momentum of Light: Preparation of Photons in Multidimensional Vector States of Angular
• Dynamic Nonlinear X-waves for Femtosecond Pulse Propagation in Water
• Rotating optical soliton clusters
• Induced Coherence and Stable Soliton Spiraling
• Spectral-discrete solitons and localization in frequency space

Cited by in corpus (2)

• Robust excitation and Raman conversion of guided vortices in chiral gas-filled photonic crystal fiber
• Vortex solitons in an off-resonant Raman medium