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

Mangini, Fabio; Ferraro, Mario; Zitelli, Mario; Niang, A.; Mansuryan, Tigran; Tonello, Alessandro; Couderc, Vincent; Luca, Antonio De; Babin, Sergey A.; Frezza, Fabrizio; Wabnitz, Stefan

doi:10.1364/ol.445321

Cited by 18 publications

(8 citation statements)

References 24 publications

(31 reference statements)

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“…This can be easily achieved in optical fibers by exploiting their cylindrical geometry. Indeed, in order to provide OAM to a Gaussian laser beam it is sufficient to inject it into the fiber core with nonzero tilt angle (ϑ) and transverse displacement (y 0 ) with respect to the fiber axis [43,44]. In this way, the beam acquires an OAM, so that…”

Section: Thermalization Of Oam-carrying Beamsmentioning

confidence: 99%

Mode Decomposition Method for Investigating the Nonlinear Dynamics of a Multimode Beam

et al. 2023

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We overview our recent experimental studies on the nonlinear spatial reshaping of multimode beams at the output of multimode optical fibers. We use a holographic mode decomposition technique, which permits to reveal the variation of the spatial mode composition at the fiber output, as determined by either conservative (the Kerr effect) or dissipative (Raman scattering) nonlinear processes. For the first case, we consider the effect of spatial beam self-cleaning, and we compare experimental mode decompositions with predictions based on the thermodynamic theory, including the case of beams carrying nozero orbital angular momentum. For the second case, we analyze the beam mode content at the output of a Raman laser based on a graded index multimode fiber.

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Section: Thermalization Of Oam-carrying Beamsmentioning

confidence: 99%

Mode Decomposition Method for Investigating the Nonlinear Dynamics of a Multimode Beam

et al. 2023

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“…The latter is a technique for indirectly gathering information about the propagation of laser beams inside the fiber, as well as about the fiber characteristics [54,55]. For example, fiber luminescences has been recently exploited to track the propagation path of helical beams [56,57], as well as for estimating the frequency cutoff of SMFs [58]. Information about the physical phenomena behind the excitation of fiber luminescence, and a scheme of the experimental set-up for its characterization, are reported in the Appendix 4.…”

Section: Luminescence Of Fiber Defectsmentioning

confidence: 99%

X-ray computed µ-tomography for the characterization of optical fibers

Ferraro

Crocco

Mangini

et al. 2022

Opt. Mater. Express

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In spite of their ubiquitous applications, the characterization of glass fibers by means of alloptical techniques is still facing some limitations. Recently, X-ray absorption has been proposed as a method for visualizing the inner structure of both standard and microstructure optical fibers. Here, we exploit X-ray absorption as nondestructive technique for the characterization of optical glass fibers. Starting from absorption contrast X-ray computed micro-tomography measurements, we obtain information about the spatial profile of the fiber refractive index at optical frequencies. We confirm the validity of our approach by comparing its results with complementary characterization techniques, based on electron spectroscopy or multiphoton microscopy.

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“…This results from the multiphoton absorption (MPA) of some silica defects like non-bridging oxygen hole centers and oxygen deficiency centers [24]. The emission of visible light is even more spectacular when the beam power is above the breakdown threshold, as multiphoton ionization (MPI) effects lead to the formation of bright plasma filaments (PFs) [25,26], which can be curved in a helical fashion by exploiting the cylindrical geometry of the fiber [27]. Interestingly, aside from fundamental studies, exploiting UL allows for practical outcomes.…”

Section: Introductionmentioning

confidence: 99%

Observation of Visible Upconversion Luminescence of Soft Glass Multimode Fibers

Ferraro,

Mangini,

Filosa

et al. 2024

Fibers

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This research investigates the visible upconversion luminescence which is induced by multiphoton absorption of soft glass fiber defects. The study of this phenomenon has thus far been restricted to standard silica fibers. We observed the emission of green and cyan light as a consequence of fiber material ionization. We investigate both the commercial ZBLAN step index and in-house-made tellurite nanostructured graded-index fibers. For the latter, the analysis of the luminescence signal permits us to determine the core and cladding refractive index difference. Upconversion luminescence is a powerful tool for characterizing soft glass fibers and a promising platform for innovative photonic technologies and mid-IR applications.

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

Cited by 18 publications

References 24 publications

Mode Decomposition Method for Investigating the Nonlinear Dynamics of a Multimode Beam

Mode Decomposition Method for Investigating the Nonlinear Dynamics of a Multimode Beam

X-ray computed µ-tomography for the characterization of optical fibers

Observation of Visible Upconversion Luminescence of Soft Glass Multimode Fibers

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