Authors
Darryl Naidoo, Filippus Roux, Angela Dudley, Igor Litvin, Bruno Piccirillo, Lorenzo Marucci, Andrew Forbes
Publication date
2016
Journal
Nature Photonics
Volume
10
Pages
327–332
Description
The angular momentum of light can be described by positions on a higher-order Poincaré sphere, where superpositions of spin and orbital angular momentum states give rise to laser beams that have many applications, from microscopy to materials processing. Many techniques exist to create such beams but none so far allow their creation at the source. Here we report on a new class of laser that is able to generate all states on the higher-order Poincaré sphere. We exploit geometric phase control inside a laser cavity to map polarization to orbital angular momentum, demonstrating that the orbital angular momentum degeneracy of a standard laser cavity may be broken, producing pure orbital angular momentum beams, and that generalized vector vortex beams may be created with high purity at the source. This work paves the way to new lasers for structured light based on intracavity geometric phase control.
Total citations
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Scholar articles
D Naidoo, FS Roux, A Dudley, I Litvin, B Piccirillo… - Nature Photonics, 2016