D. Modotto
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View article: Factors limiting second harmonic generation efficiency in optically poled fibers
Factors limiting second harmonic generation efficiency in optically poled fibers Open
We investigated the efficiency limitations of second-harmonic generation (SHG) in spliced optically poled Corning HI980 fiber segments. Although theory predicts quadratic growth with segment number, experiments show nearly linear efficienc…
View article: Cascaded geometric parametric process in a tapered air–silica graded-like multimode microstructure fiber
Cascaded geometric parametric process in a tapered air–silica graded-like multimode microstructure fiber Open
We experimentally study the spatial beam profile and the spectral broadening at the output of a multimode air–silica microstructure fiber taper, used along the direction of an increasing fiber diameter. By using a laser pump at 1064 nm emi…
View article: Numerical analysis of beam self-cleaning in multimode fiber amplifiers
Numerical analysis of beam self-cleaning in multimode fiber amplifiers Open
Recent experimental results have reported the observation of beam self-cleaning or, more generally, nonlinear beam reshaping in active multimode fibers. In this work, we present a numerical analysis of these processes by considering the id…
View article: Numerical analysis of beam self-cleaning in multimode fiber amplifiers
Numerical analysis of beam self-cleaning in multimode fiber amplifiers Open
Recent experimental results have reported the observation of beam self-cleaning or, more generally, nonlinear beam reshaping in active multimode fibers. In this work we present a numerical analysis of these processes, by considering the id…
View article: Frequency comb generation in silicon nitride resonators with amplitude modulated pump
Frequency comb generation in silicon nitride resonators with amplitude modulated pump Open
We investigate frequency comb generation in silicon nitride ring resonators by using a pump subject to a weak amplitude modulation. We show that a partial locking is obtained when the external modulation frequency differs from the resonato…
View article: Spatial beam nonlinear control with multimode GRIN fiber amplifiers
Spatial beam nonlinear control with multimode GRIN fiber amplifiers Open
We analyzed the nonlinear dynamics of pulsed beam self-cleaning in nonlinear tapered Ytterbium doped and Erbium-Ytterbium codoped graded-index multimode optical fibers, with quasi-uniform doping distribution in the core cross-section. By i…
View article: Spatial Beam Evolution in Nonlinear Multimode Fibers
Spatial Beam Evolution in Nonlinear Multimode Fibers Open
We discuss some recent results illustrating the role of input wave-front shaping, propagation dynamics and output beam diagnostics in order to observe spatial beam cleaning in nonlinear multimode fibers and amplifiers.
View article: Spatial Beam Self-Cleaning in Tapered Yb-Doped GRIN Multimode Fiber With Decelerating Nonlinearity
Spatial Beam Self-Cleaning in Tapered Yb-Doped GRIN Multimode Fiber With Decelerating Nonlinearity Open
We experimentally demonstrate spatial beam self-cleaning in an Yb-doped graded-index multimode fiber taper, both in passive and active configurations. The input laser beam at 1064 nm was injected for propagation from the small to the large…
View article: Nonlinear beam cleanup in Yb-doped GRIN multimode fiber taper
Nonlinear beam cleanup in Yb-doped GRIN multimode fiber taper Open
We demonstrate beam self-cleaning in a tapered Ytterbium-doped graded-index multimode fiber in both active and passive configurations, without accompanying self-phase modulation induced spectral broadening or frequency conversion.
View article: Spatial beam self-cleaning in tapered Yb-doped GRIN multimode fiber with decelerating nonlinearity
Spatial beam self-cleaning in tapered Yb-doped GRIN multimode fiber with decelerating nonlinearity Open
We experimentally demonstrate spatial beam self-cleaning in an Yb-doped graded-index multimode fiber taper, both in passive and active configurations. The input laser beam at 1064 nm was injected for propagation from the small to the large…
View article: Multimode nonlinear fiber optics, a spatiotemporal avenue
Multimode nonlinear fiber optics, a spatiotemporal avenue Open
We provide a perspective overview of the emerging field of nonlinear optics in multimode optical fibers. These fibers enable new methods for the ultrafast light-activated control of temporal, spatial, and spectral degrees of freedom of int…
View article: Adaptive Kerr-Assisted Transverse Mode Selection in Multimode Fibers
Adaptive Kerr-Assisted Transverse Mode Selection in Multimode Fibers Open
Multimode optical fibers (MMFs) have recently regained interest because of the degrees of freedom associated with their different eigenmodes. In the nonlinear propagation regime in particular, new phenomena have been unveiled in graded-ind…
View article: Spatial Kerr Beam Self-Cleaning in Yb-Doped Multimode Fiber Taper
Spatial Kerr Beam Self-Cleaning in Yb-Doped Multimode Fiber Taper Open
Spatial Kerr beam self-cleaning (KBSC), which transforms an output speckled beam in a quasi-single mode beam in graded index (GRIN) multimode optical fibers (MMFs), has been reported recently [1,2]. GRIN MMFs are also interesting waveguide…
View article: Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands
Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands Open
We introduce the concept of spatial and spectral control of nonlinear parametric sidebands in multimode optical fibers by tailoring their linear refractive index profile. In all cases, the pump experiences Kerr self-cleaning, leading to a …
View article: Self-cleaning on a higher order mode in Ytterbium-doped multimode fiber with parabolic profile
Self-cleaning on a higher order mode in Ytterbium-doped multimode fiber with parabolic profile Open
International audience
View article: Spatiotemporal dynamics in multimode nonlinear optical fibers
Spatiotemporal dynamics in multimode nonlinear optical fibers Open
We overview experiments associated with nonlinear beam propagation in multimode optical fibers. We show that complex spatio-temporal phenomena permit to control the nonlinear beam reshaping across its spatial, temporal and spectral dimensi…
View article: Spatial and Spectral Nonlinear Beam Control with Active Multimode Graded Index Fiber Taper
Spatial and Spectral Nonlinear Beam Control with Active Multimode Graded Index Fiber Taper Open
International audience
View article: Nonlinear optics in multimode fibers
Nonlinear optics in multimode fibers Open
We overview the emerging field of nonlinear optics in multimode optical fibers, which enable new methods for the ultrafast light-activated control of temporal, spatial and spectral degrees of freedom of intense pulsed light beams.
View article: Spatiotemporal pulse shaping with multimode nonlinear guided waves
Spatiotemporal pulse shaping with multimode nonlinear guided waves Open
International audience
View article: Spatiotemporal light-beam compression from nonlinear mode coupling
Spatiotemporal light-beam compression from nonlinear mode coupling Open
We experimentally demonstrate simultaneous spatial and temporal compression in the propagation of light
\npulses in multimode nonlinear optical fibers.We reveal that the spatial beam self-cleaning recently discovered in
\ngraded-index mult…
View article: Nonlinear dynamics in multimode optical fibers
Nonlinear dynamics in multimode optical fibers Open
We overview recent advances in the research on spatiotemporal beam shaping in nonlinear multimode optical fibers. An intense light beam coupled to a graded index (GRIN) highly multimode fiber undergoes a series of complex nonlinear process…
View article: Broadband and efficient adiabatic three-wave-mixing in a temperature-controlled bulk crystal
Broadband and efficient adiabatic three-wave-mixing in a temperature-controlled bulk crystal Open
Nonlinear interactions are commonly used to access to wavelengths not covered by standard laser systems. In particular, optical parametric amplification (OPA) is a powerful technique to produce broadly tunable light. However, common implem…
View article: Nonlinear dynamics in multimode optical fibers
Nonlinear dynamics in multimode optical fibers Open
We overview recent advances in the research on spatiotemporal beam shaping in\nnonlinear multimode optical fibers. An intense light beam coupled to a graded\nindex (GRIN) highly multimode fiber undergoes a series of complex nonlinear\nproc…
View article: Seeded intermodal four-wave mixing in a highly multimode fiber
Seeded intermodal four-wave mixing in a highly multimode fiber Open
We experimentally and theoretically investigate the process of seeded intermodal four-wave mixing in a graded index
\nmultimode fiber, pumped in the normal dispersion regime. By using a fiber with a 100-μm core diameter,
\nwe generate a pa…
View article: Glass Fiber Poling by an Extended Cavity Microchip Laser
Glass Fiber Poling by an Extended Cavity Microchip Laser Open
We experimentally prove that glass fibers are efficiently optically poled when inserted in the extended cavity of a microchip laser. Methodical second harmonic measurements confirm the good quality of the poling.
View article: Spatiotemporal beam shaping in nonlinear multimode fibers
Spatiotemporal beam shaping in nonlinear multimode fibers Open
Kerr beam self-cleaning in graded-index multimode fibers is accompanied by power-dependent temporal pulse reshaping. We explore the complex nonlinear dynamics with a single long pulse, where the optical power is continuously varied across …
View article: Nonlinear polarization dynamics of Kerr beam self-cleaning in a GRIN multimode optical fiber
Nonlinear polarization dynamics of Kerr beam self-cleaning in a GRIN multimode optical fiber Open
We experimentally study the polarization dynamics of Kerr beam self-cleaning in a multimode fiber. We reveal that spatial beam cleanup is accompanied by nonlinear polarization evolution and a significant increase of the degree of polarizat…
View article: Kerr Beam Self-Cleaning in Multimode Fibers
Kerr Beam Self-Cleaning in Multimode Fibers Open
We overview recent experimental results of beam self-cleaning observed in various types of multimode fibers. We analyze the output spatial beam shapes and their connection with the refractive index profile of the fibers.