Distinguishing nonlinear processes in atomic media via orbital angular momentum transfer

Abstract

We suggest a technique based on the transfer of topological charge from applied laser radiation to directional and coherent optical fields generated in ladder-type excited atomic media to identify the major processes responsible for their appearance. As an illustration, in Rb vapours we analyse transverse intensity and phase profiles of the forward-directed collimated blue and near-IR light using self-interference and astigmatic transformation techniques when either or both of two resonant laser beams carry orbital angular momentum. Our observations unambiguously demonstrate that emission at 1.37 μm is the result of a parametric four-wave mixing process involving only one of the two applied laser fields.

4 pages, 5 figures

References in corpus (4)

• Trans-spectral orbital angular momentum transfer via four wave mixing in Rb vapor
• Coherent 455nm beam production in cesium vapor
• Collimated Blue and Infrared Beams Generated by Two-Photon Excitation in Rb Vapor
• Directional infrared emission resulting from cascade population inversion and four-wave mixing in Rb vapours

Cited by in corpus (16)

• Azimuthal modulation of electromagnetically induced transparency using structured light
• High Helicity Vortex Conversion in a Rubidium Vapor
• Arithmetic with optical topological charged in step-wise excited Rb vapour
• Gaussian Beam-Propagation Theory for Nonlinear Optics - Featuring an Exact Treatment of Orbital Angular Momentum Transfer
• Four-wave mixing based orbital angular momentum translation
• Rayleigh scattering of twisted light by hydrogenlike ions
• Optical cavity for enhanced parametric four-wave mixing in rubidium
• Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vapor
• Comparison of collimated blue light generation in ${}^{85}$Rb atoms via the D${}_1$ and D${}_2$ lines
• Formation and Controlling of Optical Hopfions in High Harmonic Generation
• Multi-mode four-wave mixing with a spatially-structured pump
• Saturation and alternate pathways in four-wave mixing in rubidium
• Spatial distribution of two symmetric four-wave mixing signals induced by Gaussian beams
• Coherent blue emission induced by a combination of diode and femtosecond lasers
• Poincaré sphere symmetries in four-wave mixing with orbital angular momentum
• Spatial correlations in four-wave mixing with structured light