Fibre lasers capable of producing stable, axially symmetric ring-like radiation from an extended surface may prove to be an important new light source for applications in medical imaging, sensing, bio-sensing and security systems.
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Fotiadi, A., Mégret, P. Perfect ring-like beam. Nature Photon 6, 217–219 (2012). https://doi.org/10.1038/nphoton.2012.54
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DOI: https://doi.org/10.1038/nphoton.2012.54