Experimental and numerical studies of spatiotemporal femtosecond soliton propagation over up to 1 km spans of parabolic graded-index fibers reveal that initial multimode soliton pulses naturally and irreversibly evolv...Experimental and numerical studies of spatiotemporal femtosecond soliton propagation over up to 1 km spans of parabolic graded-index fibers reveal that initial multimode soliton pulses naturally and irreversibly evolve into a single-mode soliton. This is carried by the fundamental mode of the fiber, which acts as a dynamical attractor of the multimode system for up to the record value(for multimode fibers) of 5600 chromatic dispersion distances.This experimental evidence invalidates the use of variational approaches, which intrinsically require that the initial multimode propagation of a self-imaging soliton is indefinitely maintained.展开更多
Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics,where it leads to unique nonlinear phenomena.To date,studies of the ionization regime have been limited to gas...Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics,where it leads to unique nonlinear phenomena.To date,studies of the ionization regime have been limited to gas-filled hollow-core fibers.Here,we investigate multiphoton ionization of standard optical fibers,where intense laser pulses ionize the atoms constituting the fiber structure itself,instead of that of the filling gas.We characterize material modifications produced by optical breakdown.Their formation affects laser beam dynamics over hours long temporal scales.The damage features are studied by means of optical microscopy and X-ray microtomography.In the framework of glass photonics,our results pave the way for a novel glass waveguide micromachining technique.展开更多
基金European Research Council(740355(STEMS),874596)Ministero dell’Istruzione,dell’Universitàe della Ricerca(R18SPB8227)Ministry of Education and Science of the Russian Federation(14.Y26.31.0017)。
文摘Experimental and numerical studies of spatiotemporal femtosecond soliton propagation over up to 1 km spans of parabolic graded-index fibers reveal that initial multimode soliton pulses naturally and irreversibly evolve into a single-mode soliton. This is carried by the fundamental mode of the fiber, which acts as a dynamical attractor of the multimode system for up to the record value(for multimode fibers) of 5600 chromatic dispersion distances.This experimental evidence invalidates the use of variational approaches, which intrinsically require that the initial multimode propagation of a self-imaging soliton is indefinitely maintained.
基金European Research Council(740355)Ministero dell’Istruzione,dell’Universitàe della Ricerca(PIR01-00008,R18SPB8227)+1 种基金Ministry of Education and Science of the Russian Federation(14.Y26.31.0017)Agence Nationale de la Recherche(ANR-10-LABX-0074-01,ANR-18-CE080016-01)。
文摘Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics,where it leads to unique nonlinear phenomena.To date,studies of the ionization regime have been limited to gas-filled hollow-core fibers.Here,we investigate multiphoton ionization of standard optical fibers,where intense laser pulses ionize the atoms constituting the fiber structure itself,instead of that of the filling gas.We characterize material modifications produced by optical breakdown.Their formation affects laser beam dynamics over hours long temporal scales.The damage features are studied by means of optical microscopy and X-ray microtomography.In the framework of glass photonics,our results pave the way for a novel glass waveguide micromachining technique.
