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Nonlinear Photonics ERC LAB

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Autore: laboratorio

Multimode soliton collisions in graded-index optical fibers

8 Luglio 20228 Luglio 2022 laboratorio

In this work, we unveil the unique complex dynamics of multimode soliton interactions in graded-index optical fibers through simulations and experiments. By generating two multimode solitons from the fission of an input femtosecond pulse, we examine the evolution of their Read More …

News

Statistical mechanics of beam self-cleaning in GRIN multimode optical fibers

26 Maggio 202226 Maggio 2022 laboratorio

Since its first demonstration in graded-index multimode fibers, spatial beam self-cleaning has attracted a growing research interest. It allows for the propagation of beams with a bell-shaped spatial profile, thus enabling the use of multimode fibers for several applications, from Read More …

News

Multiphoton ionization of standard optical fibers

26 Maggio 202226 Maggio 2022 laboratorio

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 Read More …

News

Helical plasma filaments from the self-channeling of intense femtosecond laser pulses in optical fibers

23 Febbraio 2022 laboratorio

We experimentally and numerically study the ignition of helical-shaped plasma filaments in standard optical fibers. Femtosecond pulses with megawatt peak power with proper off-axis and tilted coupling in the fiber core produce plasma skew rays. These last for distances as Read More …

News

Femtosecond nonlinear losses in multimode optical fibers

23 Febbraio 202223 Febbraio 2022 laboratorio

Multimode optical fibers are attracting a growing interest for their capability to transport high-power laser beams, coupled with novel nonlinear optics-based applications. However, optical fiber breakdown occurs when beam intensities exceed a certain critical value. Optical breakdown associated with irreversible Read More …

News

Multimode solitons in step-index fibers

23 Febbraio 202223 Febbraio 2022 laboratorio

We experimentally generate multimode solitons in step-index fibers, where nonlinearity compensates for both chromatic and modal dispersion. These solitons are subject to Raman self-frequency shift, and their energy is gradually transfered to the fundamental fiber mode. We compare multimode soliton Read More …

News

NOSTER

25 Novembre 202125 Novembre 2021 laboratorio

Nonlinear spatiotemporal light bullets: origin and stability

Projects

Spatiotemporal beam self‑cleaning for high‑resolution nonlinear fuorescence imaging with multimode fber

20 Settembre 202120 Settembre 2021 laboratorio

Beam self-cleaning (BSC) in graded-index (GRIN) multimode fbers (MMFs) has been recently reported by diferent research groups. Driven by the interplay between Kerr efect and beam self-imaging, BSC counteracts random mode coupling, and forces laser beams to recover a quasi-single Read More …

News

Conditions for walk-off soliton generation in a multimode fiber

13 Settembre 202113 Settembre 2021 laboratorio

It has been recently demonstrated that multimode solitons are unstable objects which evolve, in the range of hundreds of nonlinearity lengths, into stable single-mode solitons carried by the fundamental mode. We show experimentally and by numerical simulations that femtosecond multimode Read More …

News

Experimental observation of self-imaging in SMF-28 optical fibers

13 Settembre 202113 Settembre 2021 laboratorio

Spatial self-imaging, consisting of the periodic replication of the optical transverse beam profile along the propagation direction, can be achieved in guided wave systems when all excited modes interfere in phase. We exploited material defects photoluminescence for directly visualizing self-imaging Read More …

News

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