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Proceedings Paper

Characterising laser beams with liquid crystal displays
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Paper Abstract

We show how one can determine the various properties of light, from the modal content of laser beams to decoding the information stored in optical fields carrying orbital angular momentum, by performing a modal decomposition. Although the modal decomposition of light has been known for a long time, applied mostly to pattern recognition, we illustrate how this technique can be implemented with the use of liquid-crystal displays. We show experimentally how liquid crystal displays can be used to infer the intensity, phase, wavefront, Poynting vector, and orbital angular momentum density of unknown optical fields. This measurement technique makes use of a single spatial light modulator (liquid crystal display), a Fourier transforming lens and detector (CCD or photo-diode). Such a diagnostic tool is extremely relevant to the real-time analysis of solid-state and fibre laser systems as well as mode division multiplexing as an emerging technology in optical communication.

Paper Details

Date Published: 3 February 2017
PDF: 5 pages
Proc. SPIE 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems, 100360W (3 February 2017); doi: 10.1117/12.2244258
Show Author Affiliations
Angela Dudley, CSIR National Laser Ctr. (South Africa)
Darryl Naidoo, CSIR National Laser Ctr. (South Africa)
Andrew Forbes, Univ. of the Witwatersrand (South Africa)


Published in SPIE Proceedings Vol. 10036:
Fourth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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