Femtosecond nonlinear losses in multimode optical fibers

作     者：MARIO FERRARO FABIO MANGINI MARIO ZITELLI ALESSANDRO TONELLO ANTONIO DE LUCA VINCENT COUDERC STEFAN WABNITZ 

作者机构：Department of Information EngineeringElectronicsand TelecommunicationsSapienza University of RomeVia Eudossiana 1800184 RomeItaly Department of Information EngineeringUniversity of BresciaVia Branze 3825123 BresciaItaly Universitéde LimogesXLIMUMR CNRS 7252123 Avenue A.Thomas87060 LimogesFrance Physics DepartmentUniversity of CalabriaI-87036 Arcavacata di RendeCSItaly CNR Nanotec-Institute of NanotechnologyS.S.CosenzaI-87036 RendeCSItaly CNR-INOIstituto Nazionale di OtticaVia Campi Flegrei 34I-80078 PozzuoliNAItaly 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2021年第9卷第12期

页      面：2443-2453页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Ministero dell’Istruzione,dell’Universitàe 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) 

主　　题：breakdown Femto fibers 

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