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Article Dans Une Revue Nature Communications Année : 2023

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

Résumé

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 in reducing their loss regardless of the fiber cladding confinement power. To attain fibers performing at short wavelengths, it is paramount developing means to minimize the height variations of the fiber microstructure boundaries. Here, we report on the reduction of the core surface roughness of hollow-core fibers by modifying their fabrication technique. In the novel process proposed herein, counter-directional gas fluxes are applied within the fiber holes during fabrication to attain an increased shear rate on its microstructure. The effect of the process on the surface roughness has been quantified by optical profilometry and the results showed that the root-mean-square surface roughness has been reduced from 0.40 nm to 0.15 nm. The improvement in the fiber core surface quality entailed fibers with ultralow loss in the short-wavelength range. We report on fibers with record loss values as low as 50 dB/km at 290 nm, 9.7 dB/km at 369 nm, 5.0 dB/km at 480 nm, 0.9 dB/km at 558 nm and 1.8 dB/km at 719 nm. The results reveal this new approach as a promising path for the development of hollow-core fibers guiding at short wavelengths with loss that can potentially be orders of magnitude lower than the ones achievable with their silica-core counterparts.
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Dates et versions

hal-04009825 , version 1 (01-03-2023)

Identifiants

Citer

Jonas H Osório, Foued Amrani, Frédéric Delahaye, Ali Dhaybi, Kostiantyn Vasko, et al.. Hollow-core fibers with reduced surface roughness and ultralow loss in the short-wavelength range. Nature Communications, 2023, 14, pp.1146. ⟨10.1038/s41467-023-36785-6⟩. ⟨hal-04009825⟩
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