
Proceedings Paper
Extending the OAM spiral bandwidth by radial mode control (Conference Presentation)
Paper Abstract
The most common approach to create orbital angular momentum (OAM) carrying vortex beams is by modulating a Gaussian beam with an azimuthal phase profile. This results in a beam with many radial modes and hence reduced power in the desired mode. Here we show that it is possible to select the mode size of the Laguerre-Gaussian basis so that the power in the detected p = 0 mode is maximised. We outline the idea theoretically and confirm it experimentally with both classical and quantum tests, demonstrating a power increase by as much as 50x. The consequence is higher signal-to- noise in optical communication and larger available dimensions in quantum entanglement experiments when using OAM modes as a basis.
Paper Details
Date Published: 10 September 2019
PDF
Proc. SPIE 11134, Quantum Communications and Quantum Imaging XVII, 111340T (10 September 2019); doi: 10.1117/12.2530009
Published in SPIE Proceedings Vol. 11134:
Quantum Communications and Quantum Imaging XVII
Keith S. Deacon, Editor(s)
Proc. SPIE 11134, Quantum Communications and Quantum Imaging XVII, 111340T (10 September 2019); doi: 10.1117/12.2530009
Show Author Affiliations
Andrew Forbes, Univ. of the Witwatersrand, Johannesburg (South Africa)
Published in SPIE Proceedings Vol. 11134:
Quantum Communications and Quantum Imaging XVII
Keith S. Deacon, Editor(s)
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