Femtosecond nonlinear losses in multimode optical fibers

Year: 2021

Authors: Ferraro M., Mangini F., Zitelli M., Tonello A., De Luca A., Couderc V., Wabnitz S.

Autors Affiliation: Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; Univ Limoges, XLIM, UMR CNRS 7252, 123 Ave A Thomas, F-87060 Limoges, France; Univ Calabria, Phys Dept, I-87036 Arcavacata Di Rende, CS, Italy; CNR, Nanotec Inst Nanotechnol, I-87036 Arcavacata Di Rende, CS, Italy; CNR INO, Ist Nazl Ott, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy.

Abstract: Multimode optical fibers are attracting a growing interest for their capability to transport high-power laser beams, coupled with novel nonlinear optics-based applications. However, optical fiber breakdown occurs when beam intensities exceed a certain critical value. Optical breakdown associated with irreversible modifications of the refractive index, triggered by multiphoton absorption, has been largely exploited for fiber material microstructuration. Here we show that, for light beam intensities slightly below the breakdown threshold, nonlinear absorption strongly affects the dynamics of a propagating beam as well. We experimentally analyze this subthreshold regime and highlight the key role played by spatial self-imaging in graded-index fibers for enhancing nonlinear optical losses. We characterize the nonlinear power transmission properties of multimode fibers for femtosecond pulses propagating in the near-infrared spectral range. We show that an effective N-photon absorption analytical model is able to describe the experimental data well.

Journal/Review: PHOTONICS RESEARCH

Volume: 9 (12)      Pages from: 2443  to: 2453

More Information: Ministero dellŽIstruzione, dellŽUniversita e della Ricerca (R18SPB8227); European Research Council (740355, 874596); Region Nouvelle Aquitaine (F2MH, SIP2); National Research Agency under the Investments for the future program (ANR-10-LABX-0074-01 Sigma-LIM).
KeyWords: dynamics; generation; nanosecond; breakdown
DOI: 10.1364/PRJ.425878

ImpactFactor: 7.254
Citations: 16
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-03
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