Self-reconstruction of light filaments

Dubietis, A.; Kucinskas, E.; Tamošauskas, G.; Gaižauskas, E.; Porras, Miguel A.; Trapani, P. Di

doi:10.1364/ol.29.002893

Cited by 67 publications

(42 citation statements)

References 15 publications

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“…Consequently, filament represents a narrow, high-intensity central part of a GB beam, whose propagation losses are replenished from the low-intensity side lobes containing the main part of the beam's energy. This model is strongly supported by recent experimental and theoretical results [7,10,11] demonstrating extreme robustness (self-healing) of the filaments in reconstructing their intensity after encountering microscopic obstacles.In most of the studies reported so far filamentation was seeded using laser beams with Gaussian transverse profiles. Having in mind the GB nature of filaments, the possibility of directly launching a powerful Bessel beam into the material and thus circumventing the internal transformation from Gaussian toward GB beam, is intriguing.…”

supporting

confidence: 68%

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confidence: 68%

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Discrete damage traces from filamentation of Gauss-Bessel pulses

et al. 2006

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Filamentation of Bessel-Gauss pulses propagating in borosilicate glass is found to produce damage lines extending over hundreds of micrometers and consisting of discrete, equidistant damage spots. These discrete damage traces are explained by self-regeneration of Gauss-Bessel beams during the propagation and are potentially applicable in laser microfabrication of transparent materials.Light filaments formed by laser beams propagating in transparent media present an interesting case of spatial, and possibly, temporal localization of electromagnetic radiation at extremely high power densities sustainable over significant propagation lengths. The potential areas of applications of such light channeling range from remote sensing and LIDAR to laser microscopy and microfabrication. Generation and dynamics of light filaments is explained using a wide range of physical models. Some of them adopt moving focus model [1] which implies that filamentation is merely an optical illusion occurring when time-integrated detection is used. Others describe filaments as self-channelled beams [2, 3] whose stationarity is supported by a balance between Kerr-induced self-focusing and plasma-induced defocusing; a genuine soliton-like propagation, however, is destroyed by additional physical effects [4]. The dynamic spatial replenishment model [5] treats filamentation as a cyclic defocusing and focusing due to the dynamic interplay between the Kerr and plasma effects. According to the recently proposed "filamentation without self-channelling" model [6,7], multiphoton absorption alone can dynamically balance the self-focusing, thus leading to filamentation. It was shown numerically [8] that the absorption transforms the initial Gaussian beam toward the Gauss-Bessel (GB) beam, which is a modified solution of the free-space Helmholz equation [9]. Consequently, filament represents a narrow, high-intensity central part of a GB beam, whose propagation losses are replenished from the low-intensity side lobes containing the main part of the beam's energy. This model is strongly supported by recent experimental and theoretical results [7,10,11] demonstrating extreme robustness (self-healing) of the filaments in reconstructing their intensity after encountering microscopic obstacles.In most of the studies reported so far filamentation was seeded using laser beams with Gaussian transverse profiles. Having in mind the GB nature of filaments, the possibility of directly launching a powerful Bessel beam into the material and thus circumventing the internal transformation from Gaussian toward GB beam, is intriguing. The internal transformation is governed by the materials' nonlinear response, which may limit the obtainable peak intensity of the GB beam. An external GB beam (e.g., generated using an axicon) may have power sufficient for inducing and sustaining extensive damage along its entire propagation path. The possibility to fabricate extended lines in transparent solids almost instantaneously is beneficial for laser microfabrication. Here we show ...

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confidence: 68%

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confidence: 68%

Discrete damage traces from filamentation of Gauss-Bessel pulses

et al. 2006

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“…Nonlinear Xwaves [93,94] and O-waves [95] are named because of their evident X-like and O-like shapes, respectively, which appear in both the near-and the far-fields. Moreover, the interpretation of light filaments in the framework of conical waves readily explains the distinctive propagation features of light filaments such as the sub-diffractive propagation in the free space [83,92] and self-reconstruction after hitting physical obstacles [96][97][98], which are universal and regardless of the sign of material GVD, and which were verified experimentally as well. Therefore all subsequent features of the filament propagation in the regime of normal GVD, i.e.…”

Section: Conical Emissionmentioning

confidence: 54%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

167

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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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“…By contrast, blocked central spike (with beam stopper inside water cell) is quickly rebuilt by the energy flux from the beam periphery. Reconstruction effect was also observed in the linear propagation regime, i. e. outside the water cell, justifying the conical nature of spontaneously built wave [30]. Recent research in connection with air filaments has arrived to similar results, demonstrating self-reconstruction property of air filaments when colliding with water droplets [31], and immediate termination of filamentation process if the beam periphery is removed [32].…”

Section: Self-focusing Of Optical Wave Packetsmentioning

confidence: 56%

Nonlinear localization of light

Dubietis¹

2006

Lithuanian J. Phys.

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We briefly overview historical, fundamental, and practical aspects of light wave propagation, where strong multidimensional localization and precise control of ultrashort signals is demanded. The main topic is focused on the state of art of recently discovered nonlinear conical waves, or so-called X-shaped light bullets, which have been demonstrated to appear spontaneously in many different, frequently encountered operating regimes in transparent gaseous, liquid, and solid media. Owing to unique features of white-light frequency spectrum, strong localization, deep-field stationarity, and hot-spot regeneration property, nonlinear conical waves have great potential in all applications requiring energy transfer to matter over very limited transverse areas in thick media, which thus suffer the short focal depth of conventional laser beams. Practical applications that cover many different areas ranging from nano-science to high-field physics are discussed.

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Self-reconstruction of light filaments

Cited by 67 publications

References 15 publications

Discrete damage traces from filamentation of Gauss-Bessel pulses

Discrete damage traces from filamentation of Gauss-Bessel pulses

Ultrafast supercontinuum generation in bulk condensed media

Nonlinear localization of light

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