4篇
您的检索式：作者名="VINCENT COUDERC"
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| 1 | Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers显示文摘We develop a spatiotemporal mode decomposition technique to study the spatial and temporal mode power distribution of ultrashort pulses in long spans of graded-index multimode fiber,for different input laser conditions.We find that the beam mode power content in the dispersive pulse propagation regime can be described by the Bose-Einstein law,as a result of the process of power diffusion from linear and nonlinear mode coupling among nondegenerate mode groups.In the soliton regime,the output mode power distribution approaches the Rayleigh-Jeans law. | MARIO ZITELLI VINCENT COUDERC MARIO FERRARO FABIO MANGINI PEDRO PARRA-RIVAS YIFAN SUN STEFAN WABNITZ | 2023 | Photonics Research2023，11，5： | 0 |
| 2 | Femtosecond nonlinear losses in multimode optical fibers显示文摘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. | MARIO FERRARO FABIO MANGINI MARIO ZITELLI ALESSANDRO TONELLO ANTONIO DE LUCA VINCENT COUDERC STEFAN WABNITZ | 2021 | Photonics Research2021，9，12： | 0 |
| 3 | Spatial beam reshaping and large-band nonlinear conversion in rectangular-core phosphate glass fibers显示文摘Here we present the ability of Nd^(3+)-doped zinc-phosphate glasses to be shaped into rectangular core fibers.At first,the physico-chemical properties of the developed P_(2)O_(5)-based materials are investigated for different concentrations of neo-dymium oxide and core and cladding glass compositions are selected for further fiber development.A modified stack-and-draw technique is used to produce multimode large rectangular-core optical fibers.Self-guided nonlinear effects acting as spatial beam reshaping processes occurring in these newly-developed photonic structures lead to the generation of spectral broadenings in the visible and near-infrared spectral domains. | Clement Strutynski Vincent Couderc Tigran Mansuryan Giorgio Santarelli Philippe Thomas Sylvain Danto Thierry Cardinal | 2022 | Frontiers of Optoelectronics2022，15，1： | 0 |
| 4 | GaAs-chip-based mid-infrared supercontinuum generation显示文摘The mid-infrared spectral region opens up new possibilities for applications such as molecular spectroscopy with high spatial and frequency resolution.For example,the mid-infrared light provided by synchrotron sources has helped for early diagnosis of several pathologies.However,alternative light sources at the table-top scale would enable better access to these state-of-the-art characterizations,eventually speeding up research in biology and medicine.Midinfrared supercontinuum generation in highly nonlinear waveguides pumped by compact fiber lasers represents an appealing alternative to synchrotrons.Here,we introduce orientation-patterned gallium arsenide waveguides as a new versatile platform for mid-infrared supercontinuum generation.Waveguides and fiber-based pump lasers are optimized in tandem to allow for the group velocities of the signal and the idler waves to match near the degeneracy point.This configuration exacerbates supercontinuum generation from 4 to 9μm when waveguides are pumped at 2750 nm with few-nanojoule energy pulses.The brightness of the novel mid-infrared source exceeds that of the thirdgeneration synchrotron source by a factor of 20.We also show that the nonlinear dynamics is strongly influenced by the choice of waveguide and laser parameters,thus offering an additional degree of freedom in tailoring the spectral profile of the generated light.Such an approach then opens new paths for high-brightness mid-infrared laser sources development for high-resolution spectroscopy and imaging.Furthermore,thanks to the excellent mechanical and thermal properties of the waveguide material,further power scaling seems feasible,allowing for the generation of watt-level ultra-broad frequency combs in the mid-infrared. | Geoffroy Granger Myriam Bailly Hugo Delahaye Cristian Jimenez Idris Tiliouine Yann Leventoux Jean-Christophe Orlianges Vincent Couderc Bruno Gérard Rezki Becheker Said Idlahcen Thomas Godin Ammar Hideur Arnaud Grisard Eric Lallier Sébastien Février | 2023 | Light(Science & Applications)2023，12，11： | 0 |
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