Second harmonic generation in multimode graded-index fibers: Spatial beam cleaning and multiple harmonic sideband generation

Year: 2017

Authors: Ceoldo D., Krupa K., Tonello A., Couderc V., Modotto D., Minoni U., Millot G., Wabnitz S.

Autors Affiliation: Dipartimento di Ingegneria dell\’Informazione, Università di Brescia, via Branze 38, Brescia, 25123, Italy; Université de Bourgogne Franche-Comté, ICB UMR CNRS 6303, 9 Avenue A. Savary, Dijon, 21078, France; Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, Limoges, 87060, France; Novosibirsk State University, 1 Pirogova str., Novosibirsk, 630090, Russian Federation

Abstract: We study experimentally and numerically the spectral and spatial dynamics of second harmonic generation in an all-optically poled multimode graded-index fiber. In contrast with poled single-mode fibers, in a multimode graded-index fiber a pump can generate a series of sharp sidebands around its second harmonic (SH) that originate from the sub-millimetric periodic evolution of the intensity at the fundamental frequency. The mutual interaction between the fundamental and its SH may also strongly affect the spatial distribution of guided light for both colors: when increasing the pump power, both fundamental and SH output beams evolve from disordered multimode speckles into two bell-shaped beams.

Journal/Review: OPTICS LETTERS

Volume: 42 (5)      Pages from: 971  to: 974

More Information: Agence Nationale de la Recherche, ANR. Ministry of Education and Science of the Russian Federation, Minobrnauka, Y26.31.0017. Labex, ACTION. Agence Nationale de la Recherche, ANR. Labex. Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR, PRIN 2015KEZNYM. Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR. – Agence Nationale de la Recherche (ANR) (LABEX SIGMA-LIM, LABEX ACTION); Ministero dell\’Istruzione, dell\’Universit? e della Ricerca (MIUR) (PRIN 2015KEZNYM); Bpifrance (OSEO); Horiba Medical (Dat@diag); Ministry of Education and Science of the Russian Federation (Minobrnauka) (14.Y26.31.0017).
KeyWords: Fibers; Harmonic analysis; Harmonic generation; Nonlinear optics; Single mode fibers, Fundamental frequencies; Graded-index fibers; Multiple harmonics; Mutual interaction; Periodic evolution; Second harmonics; Spatial beams; Spatial dynamics, Multimode fibers
DOI: 10.1364/OL.42.000971

Citations: 31
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