Hollow-core fibers with reduced surface roughness and ultralow loss in the short-wavelength range

Jonas H. Osório, Foued Amrani, Frédéric Delahaye, Ali Dhaybi, Kostiantyn Vasko, Federico Melli, Fabio Giovanardi, Damien Vandembroucq, Gilles Tessier, Luca Vincetti, Benoît Debord, Frédéric Gérôme and Fetah Benabid ()
Additional contact information
Jonas H. Osório: University of Limoges
Foued Amrani: University of Limoges
Frédéric Delahaye: University of Limoges
Ali Dhaybi: University of Limoges
Kostiantyn Vasko: University of Limoges
Federico Melli: University of Modena and Reggio Emilia
Fabio Giovanardi: University of Modena and Reggio Emilia
Damien Vandembroucq: PSL University, Sorbonne University, Paris Cité University
Gilles Tessier: Sorbonne University
Luca Vincetti: University of Modena and Reggio Emilia
Benoît Debord: University of Limoges
Frédéric Gérôme: University of Limoges
Fetah Benabid: University of Limoges

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract While optical fibers display excellent performances in the infrared, visible and ultraviolet ranges remain poorly addressed by them. Obtaining better fibers for the short-wavelength range has been restricted, in all fiber optics, by scattering processes. In hollow-core fibers, the scattering loss arises from the core roughness and represents the limiting factor for loss reduction regardless of the cladding confinement power. Here, we report on the reduction of the core surface roughness of hollow-core fibers by modifying their fabrication technique. The effect of the modified process has been quantified and the results showed a root-mean-square surface roughness reduction from 0.40 to 0.15 nm. The improvement in the core surface entailed fibers with ultralow loss at short wavelengths. The results reveal this approach as a promising path for the development of hollow-core fibers with loss that can potentially be orders of magnitude lower than the ones achievable with silica-core counterparts.

Date: 2023
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DOI: 10.1038/s41467-023-36785-6

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