We study multiphoton absorption-induced damages to standard silica multimode optical fibers, induced by means of femtosecond infrared laser beams. During the damaging process, the dynamics of beam propagation turns out to non-trivially evolve over a time scale of several hours. Such a long term evolution produces an irreversible drop of the optical transmission, which is accompanied by a drastic change of the output supercontinuum spectrum. A microscopic analysis of the damages was carried out by means of both optical microscopy and absorption-contrast computed X-ray tomography. This has permitted us to obtain information about the sign of the refractive index variation which is induced by the optical breakdown. Our results will find application in a wide array of emerging technologies employing high-power fiber optic beams, such as fiber lasers and micromachining.
Laser-induced damages in silica multimode optical fibers / Ferraro, M.; Mangini, F.; Sun, Y.; Zitelli, M.; Crescenzi, R.; Niang, A.; Crocco, M. C.; Formoso, V.; Agostino, R. G.; Barberi, R.; De Luca, A.; Tonello, A.; Babin, S. A.; Couderc, V.; Wabnitz, S.. - 12142:(2022), pp. 1-7. (Intervento presentato al convegno Fiber Lasers and Glass Photonics: Materials through Applications III 2022 tenutosi a Strasbourg; France) [10.1117/12.2623746].
Laser-induced damages in silica multimode optical fibers
Ferraro M.;Mangini F.;Sun Y.;Zitelli M.;Crescenzi R.;Niang A.;Wabnitz S.
2022
Abstract
We study multiphoton absorption-induced damages to standard silica multimode optical fibers, induced by means of femtosecond infrared laser beams. During the damaging process, the dynamics of beam propagation turns out to non-trivially evolve over a time scale of several hours. Such a long term evolution produces an irreversible drop of the optical transmission, which is accompanied by a drastic change of the output supercontinuum spectrum. A microscopic analysis of the damages was carried out by means of both optical microscopy and absorption-contrast computed X-ray tomography. This has permitted us to obtain information about the sign of the refractive index variation which is induced by the optical breakdown. Our results will find application in a wide array of emerging technologies employing high-power fiber optic beams, such as fiber lasers and micromachining.File | Dimensione | Formato | |
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