Nonlinear mixing of optical vortices with fractional topological charge in Raman sideband generation


Strohaber J., Boran Y., Sayrac M., Johnson L., Zhu F., Kolomenskii A. A. , ...More

JOURNAL OF OPTICS, vol.19, no.1, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 1
  • Publication Date: 2017
  • Doi Number: 10.1088/2040-8986/19/1/015607
  • Journal Name: JOURNAL OF OPTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sivas Cumhuriyet University Affiliated: No

Abstract

We studied the nonlinear parametric interaction of femtosecond fractionally-charged optical vortices in a Raman-active medium. Propagation of such beams was described using the Kirchhoff-Fresnel integrals by embedding a non-integer 2 pi phase step in a Gaussian beam profile. When using fractionally-charged pump or Stokes beams, we observed the production of new topological charge and phase discontinuities in the Raman field. These newly generated fractionally-charged Raman vortex beams were found to follow the same orbital angular momentum algebra derived by Strohaber et al (2012 Opt. Lett. 37 3411) for integer vortex beams.