Arithmetic with optical topological charged in step-wise excited Rb vapour

Abstract

We report on experimentally observed addition, subtraction and cancellation of orbital angular momentum (OAM) in the process of parametric four-wave mixing that results in frequency up- and down-converted emission in Rb vapour. Specific features of OAM transfer from resonant laser fields with different optical topological charges to the spatially and temporally coherent blue light have been considered. We have observed the conservation of OAM in nonlinear wave mixing in a wide range of experimental conditions including a non-collinear geometry of the applied laser beams and furthermore that the coherent blue light accumulates the total orbital angular momentum of the applied laser light. Spectral and power dependences of vortex and plane wave front blue light beams have been compared.

4 pages, 6 figures

References in corpus (4)

• Trans-spectral orbital angular momentum transfer via four wave mixing in Rb vapor
• Collapses and revivals of stored orbital angular momentum of light in a cold atomic ensemble
• Frequency evaluation of collimated blue light generated by wave mixing in Rb vapour
• Topological stability of stored optical vortices

Cited by in corpus (13)

• Spiral bandwidth of four-wave mixing in Rb vapour
• Gouy phase-matched angular and radial mode conversion in four-wave mixing
• Cavity-enhanced frequency up-conversion in rubidium vapour
• Gaussian Beam-Propagation Theory for Nonlinear Optics - Featuring an Exact Treatment of Orbital Angular Momentum Transfer
• Optical Angular Momentum Manipulations in a Four Wave Mixing Process
• Amplified spontaneous emission at 5.23 um in two-photon excited Rb vapour
• Comparison of collimated blue light generation in ${}^{85}$Rb atoms via the D${}_1$ and D${}_2$ lines
• Twisted Molecular Excitons as Mediators for Changing the Angular Momentum of Light
• Saturation and alternate pathways in four-wave mixing in rubidium
• Coherent blue emission induced by a combination of diode and femtosecond lasers
• Generation of coupled orbital angular momentum modes from an optical vortex parametric laser source
• Poincaré sphere symmetries in four-wave mixing with orbital angular momentum
• Spatial correlations in four-wave mixing with structured light