Far-field spectral characterization of conical emission and filamentation in Kerr media

Faccio, Daniele; Trapani, P. Di; Minardi, Stefano; Bramati, Alberto; Bragheri, Francesca; Liberale, Carlo; Degiorgio, Vittorio; Dubietis, A.; Matijošius, A.

doi:10.1364/josab.22.000862

Cited by 91 publications

(59 citation statements)

References 52 publications

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“…In reported experimental results there is a clear evidence of this spectral hyperbola, see e.g. [56], as well as of a structured spectrum, [10,47] as that corresponding to the splitting described in the following. The asymptotes over which energy is concentrated correspond to slash and backslash X-waves.…”

Section: General Properties Of X-wave Propagating In the Nonlinear Rementioning

confidence: 71%

Generation and nonlinear dynamics of X waves of the Schrödinger equation

Conti¹

2004

Phys. Rev. E

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The generation of finite energy packets of X-waves is analysed in normally dispersive cubic media by using an X-wave expansion. The 3D nonlinear Schroedinger model is reduced to a 1D equation with anomalous dispersion. Pulse splitting and beam replenishment as observed in experiments with water and Kerr media are explained in terms of a higher order breathing soliton. The results presented also hold in periodic media and Bose-condensed gases.

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Section: General Properties Of X-wave Propagating In the Nonlinear Rementioning

confidence: 71%

Generation and nonlinear dynamics of X waves of the Schrödinger equation

Conti¹

2004

Phys. Rev. E

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“…To date, filamentation and SC generation in the potassium dihydrogen phosphate (KDP) crystal by launching the pump beam along the optical axis of the crystal was investigated experimentally [223][224][225] and numerically [226]. The SC generation was also reported in the absence of phase matching in lithium triborate (LBO) [89] and lithium niobate (LN) [227] crystals, and in the α-barium borate (α-BBO) crystal, which exhibits birefringence, but vanishing second-order nonlinearity [228].…”

Section: Birefringent Crystalsmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

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166

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Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

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“…With the change λ = 2πc/(ω 0 + Ω), the angle-frequency (θ-Ω) spectrum can also be obtained, Ω being the detuning from the carrier frequency ω 0 . More details of the experimental layout may be found elsewhere [3]. We recorded only single-shot spectra in order to avoid averaging effects due to possible shot-to-shot fluctuations in the input pulse energy.…”

mentioning

confidence: 99%

Conical Emission, Pulse Splitting, and X-Wave Parametric Amplification in Nonlinear Dynamics of Ultrashort Light Pulses

et al. 2006

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The precise observation of the angle-frequency spectrum of light filaments in water reveals a scenario incompatible with current models of conical emission (CE). Its description in terms of linear X-wave modes leads us to understand filamentation dynamics requiring a phase-and groupmatched, Kerr-driven four-wave-mixing process that involves two highly localized pumps and two X-waves. CE and temporal splitting arise naturally as two manifestations of this process. PACS numbers: 190.5940, 320.2250 Filamentation of intense light pulses in nonlinear media has attracted much interest ever since first experimental evidences in the early '60's ([1] and references therein). Owing to the very high intensities reached during the process, several nonlinear phenomena, e.g., multiphoton absorption, plasma formation, saturable nonlinear response, stimulated Raman scattering etc., occur in addition to the optical Kerr effect. Indeed, the filament regime is enriched by peculiar phenomena like pulse splitting, self-steepening, shock-wave formation, supercontinuum generation, and conical emission (CE) [2]. In media with normal group velocity dispersion (GVD), no matter if of solid, liquid or gaseous nature, CE accompanies filamentation, producing radiation at angles that increase with increasing detuning from the carrier frequency [3,4]. In spite of the generality of the process, a clear understanding of the interplay between CE and filament dynamics is still missing. Only recently, Kolesik et al. have proposed an interpretation of filamentation dynamics in water on the basis of pulse splitting and dynamic nonlinear X waves at the far field [5], in which the double X-like structure observed in simulated anglefrequency spectra arises from the scattering of an incident field at the two main peaks of the split material response wave.Originally, CE in light filaments was interpreted in terms of the modulation instability (MI) angle-frequency gain pattern of the plane and monochromatic (PM) modes of the nonlinear Schrödinger equation (NSE) [6,7]. Measurements at large angles and detunings from the carrier frequency gave in fact results fairly compatible with this interpretation [8,9]. In the present work, owing to the use of a novel imaging spectrograph technique [3], we have been able to observe for the first time the CE in the region of small angles and detunings. The results clearly indicate a scenario not compatible with the MI analysis of PM modes. Our description by means of the spectra of the stationary linear X-waves supported by the medium, indicates that the strong localization of the self-focused field plays a crucial role in the substantial modification experienced by the MI pattern. We propose a simple picture in which the latter results from the parametric amplification of two weak X-waves by the strong, highly localized pump. Supporting this interpretation, we are able to derive, from the matching condition among the interacting waves, a simple analytical expression [Eq. (4)] that accurately determines the overall CE...

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Far-field spectral characterization of conical emission and filamentation in Kerr media

Cited by 91 publications

References 52 publications

Generation and nonlinear dynamics of X waves of the Schrödinger equation

Generation and nonlinear dynamics of X waves of the Schrödinger equation

Ultrafast supercontinuum generation in bulk condensed media

Conical Emission, Pulse Splitting, and X-Wave Parametric Amplification in Nonlinear Dynamics of Ultrashort Light Pulses

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