We demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a tilted input laser beam. The resulting breaking of the fibre axial symmetry leads to the propagation of a helical beam. The associated output far-field has a spiral shape, independently of the input laser power value. Whereas, with a high-power near-infrared femtosecond laser, a visible supercontinuum spiral emission is generated. With appropriate control of the input laser coupling conditions, the colours of the spiral spatially self-organize in a rainbow distribution. Our method is independent of the laser source wavelength and polarization. Therefore, standard optical fibres may be used for generating spiral beams in many applications, ranging from communications to optical tweezers and quantum optics.

Rainbow archimedean spiral emission from optical fibres / Mangini, F.; Ferraro, M.; Zitelli, M.; Kalashnikov, V.; Niang, A.; Mansuryan, T.; Frezza, F.; Tonello, A.; Couderc, V.; Aceves, A. B.; Wabnitz, S.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 11:1(2021), pp. 1-10. [10.1038/s41598-021-92313-w]

Rainbow archimedean spiral emission from optical fibres

Mangini, F.;Ferraro, M.;Zitelli, M.;Kalashnikov, V.;Niang, A.;Frezza, F.;Wabnitz, S.
2021

Abstract

We demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a tilted input laser beam. The resulting breaking of the fibre axial symmetry leads to the propagation of a helical beam. The associated output far-field has a spiral shape, independently of the input laser power value. Whereas, with a high-power near-infrared femtosecond laser, a visible supercontinuum spiral emission is generated. With appropriate control of the input laser coupling conditions, the colours of the spiral spatially self-organize in a rainbow distribution. Our method is independent of the laser source wavelength and polarization. Therefore, standard optical fibres may be used for generating spiral beams in many applications, ranging from communications to optical tweezers and quantum optics.
2021
nonlinear optics; multimode fibers; Kerr effect
01 Pubblicazione su rivista::01a Articolo in rivista
Rainbow archimedean spiral emission from optical fibres / Mangini, F.; Ferraro, M.; Zitelli, M.; Kalashnikov, V.; Niang, A.; Mansuryan, T.; Frezza, F.; Tonello, A.; Couderc, V.; Aceves, A. B.; Wabnitz, S.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 11:1(2021), pp. 1-10. [10.1038/s41598-021-92313-w]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1554801
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