Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Research › peer-review
Spatiotemporal guided bullets in multimode fiber. / Zitelli, M.; Ferraro, M.; Mangini, F. et al.
Nonlinear Frequency Generation and Conversion: Materials and Devices XX. ed. / Peter G. Schunemann; Kenneth L. Schepler. SPIE, 2021. 1167018 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11670).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Research › peer-review
}
TY - GEN
T1 - Spatiotemporal guided bullets in multimode fiber
AU - Zitelli, M.
AU - Ferraro, M.
AU - Mangini, F.
AU - Leggio, L.
AU - Kharenko, D. S.
AU - Niang, A.
AU - Tonello, A.
AU - Couderc, V.
AU - Hansson, T.
AU - Wabnitz, S.
N1 - Funding Information: We acknowledge the financial support from the European Union's Horizon 2020 Research and Innovation Programme via the European Research Council (Grants No. 874596 and No. 740355), the Italian Ministry of University and Research (Grant No. R18SPB8227), and the Russian Ministry of Science and Education (Grant No. 14.Y26.31.0017) Funding Information: We acknowledge the financial support from the European Union’s Horizon 2020 Research and Innovation Programme via the European Research Council (Grants No. 874596 and No. 740355), the Italian Ministry of University and Research (Grant No. R18SPB8227), and the Russian Ministry of Science and Education (Grant No. 14.Y26.31.0017) Publisher Copyright: © 2021 SPIE.
PY - 2021
Y1 - 2021
N2 - Beam self-imaging of ultrashort pulses in nonlinear graded-index (GRIN) multimode optical fibers is of interest for many applications, including spatiotemporal mode-locking in fiber lasers. We obtained a new analytical description for the nonlinear evolution of a laser beam of arbitrary transverse shape propagating in a GRIN fiber. The longitudinal beam evolution could be directly visualized by means of femtosecond laser pulses, propagating in the anomalous or in the normal dispersion regime, leading to light scattering out of the fiber core via the emission of blue photo-luminescence. As the critical power for self-focusing is approached and even surpassed, a host of previously undisclosed nonlinear effects is revealed, including strong multiphoton absorption by oxygen-deficiency center defects and Germanium inclusions, splitting and shifting of the self-imaging period, filamentation, and conical emission of the guided light bullets. We discovered that nonlinear loss has a profound influence on the process of high-order spatiotemporal soliton fission. The beam energy carried by the fiber is clamped to a fixed value, and nonlinear bullet attractors with suppressed Raman frequency shift and fixed temporal duration are generated, leading to highly efficient frequency conversion of the input near-infrared femtosecond pulses into mid-infrared multimode solitons.
AB - Beam self-imaging of ultrashort pulses in nonlinear graded-index (GRIN) multimode optical fibers is of interest for many applications, including spatiotemporal mode-locking in fiber lasers. We obtained a new analytical description for the nonlinear evolution of a laser beam of arbitrary transverse shape propagating in a GRIN fiber. The longitudinal beam evolution could be directly visualized by means of femtosecond laser pulses, propagating in the anomalous or in the normal dispersion regime, leading to light scattering out of the fiber core via the emission of blue photo-luminescence. As the critical power for self-focusing is approached and even surpassed, a host of previously undisclosed nonlinear effects is revealed, including strong multiphoton absorption by oxygen-deficiency center defects and Germanium inclusions, splitting and shifting of the self-imaging period, filamentation, and conical emission of the guided light bullets. We discovered that nonlinear loss has a profound influence on the process of high-order spatiotemporal soliton fission. The beam energy carried by the fiber is clamped to a fixed value, and nonlinear bullet attractors with suppressed Raman frequency shift and fixed temporal duration are generated, leading to highly efficient frequency conversion of the input near-infrared femtosecond pulses into mid-infrared multimode solitons.
KW - Light bullets
KW - Multimode fiber
KW - Optical solitons
KW - Raman scattering
KW - Self-focusing
KW - Ultrashort pulses
UR - http://www.scopus.com/inward/record.url?scp=85107031574&partnerID=8YFLogxK
U2 - 10.1117/12.2578222
DO - 10.1117/12.2578222
M3 - Conference contribution
AN - SCOPUS:85107031574
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Nonlinear Frequency Generation and Conversion
A2 - Schunemann, Peter G.
A2 - Schepler, Kenneth L.
PB - SPIE
T2 - Nonlinear Frequency Generation and Conversion: Materials and Devices XX 2021
Y2 - 6 March 2021 through 11 March 2021
ER -
ID: 34154870