Jonard, MaximeArosa Lobato, YagoTonello, AlessandroMansuryan, TigranColas, MaggyCornette, JulieDuclère, Jean-RenéLefort, Claire2025-03-102025-03-102024-06-28Optics Communications 569 (2024) 1308310030-4018https://hdl.handle.net/10347/40141Optical poling of multimode graded-index fibers (GRIN) has emerged as a promising technique for creating periodic inscriptions of the second-order nonlinear optical susceptibility χ(2), enabling the generation of a second harmonic in silica fibers. In this work, we investigate the generation of multiple spectral peaks using a continuous broadband source in the infrared domain, generated in the same fiber by a femtosecond laser with a central wavelength different from the one used for the poling process. Building upon theoretical foundations, this work contributes at explaining how second and third-order nonlinear processes participate to the broad generation of the second harmonic in GRIN fibersengAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Second harmonic generationNon-linear opticsOptical fibersFrequency conversion2209 Ópticajournal articleopen access