Beam filamentation and the white light continuum divergence

Brodeur, A.; Ilkov, F A; Chin, See Leang

doi:10.1016/0030-4018(96)00144-7

Cited by 95 publications

(43 citation statements)

References 21 publications

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“…. , although random in appearance, were perfectly reproducible shot to shot" (a similar observation was reported by Brodeur et al [9]). Because of this observation, Nowak and Ham conjectured that multiple filamentation was due to small inhomogeneities in the medium.…”

Section: An Experimental Testsupporting

confidence: 79%

“…In self-focusing experiments, a sufficiently intense laser beam can break-up into several long and narrow filaments, a phenomenon known as multiple filamentation [1,3,[7][8][9]11,12,14,15,28,30,[36][37][38]. According to the NLS model, however, if the input beam is cylindrically symmetric, then the beam should remain cylindrically symmetric during propagation.…”

Section: Vectorial Effects and Multiple Filamentationmentioning

confidence: 99%

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Vectorial and random effects in self-focusing and in multiple filamentation

Fibich

Ilan

2001

Physica D: Nonlinear Phenomena

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The standard explanation for multiple filamentation of laser beams is that breakup of cylindrical symmetry is initiated by noise in the input beam. In this study we propose an alternative deterministic explanation based on vectorial effects. We derive a scalar equation from the vector Helmholtz equation that describes self-focusing in the presence of vectorial and nonparaxial effects. Numerical simulations of the scalar equation show that when the input beam is sufficiently powerful, vectorial effects lead to multiple filamentation. We compare multiple filamentation due to vectorial effects with the one due to noise, and suggest how to decide which of the two leads to multiple filamentation in experiments. We also show that vectorial effects and nonparaxiality have the same effect on self-focusing of a single filament, leading to the arrest of catastrophic collapse, followed by focusing-defocusing oscillations. The magnitude of vectorial effects is, however, significantly larger than that of nonparaxiality.

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Section: An Experimental Testsupporting

confidence: 79%

Section: Vectorial Effects and Multiple Filamentationmentioning

confidence: 99%

Vectorial and random effects in self-focusing and in multiple filamentation

Fibich

Ilan

2001

Physica D: Nonlinear Phenomena

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“…Alongside fused silica, in many occasions water serves as a prototypical nonlinear medium for studies of ultrafast light-matter interactions. Systematic studies of the spectral broadening in water date back to the mid-1980s [171] and successfully continue in the femtosecond laser era, see [11,[172][173][174] for the early accounts on femtosecond SC generation in water and some other liquids.…”

Section: Watermentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

171

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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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“…(c). The formation of the filamentation in the silica glass sample is one of the most fundamental nonlinear optical phenomena and results from the dynamic balance between self-focusing arising from an increase in the refractive index and selfdefocusing arising from diffraction or plasma formation [46][47]. A series of grating could be fabricated in the silica glass sample by moving the computercontrolled XYZ translation micro-stage at different scanning speeds and different pulse energies.…”

Section: Resultsmentioning

confidence: 99%

Several Diffractive Optical Elements Fabricated by Femtosecond Laser Pulses Writing Directly

Guo¹,

Ran²,

Qu³

et al. 2010

Coherence and Ultrashort Pulse Laser Emission

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Beam filamentation and the white light continuum divergence

Cited by 95 publications

References 21 publications

Vectorial and random effects in self-focusing and in multiple filamentation

Vectorial and random effects in self-focusing and in multiple filamentation

Ultrafast supercontinuum generation in bulk condensed media

Several Diffractive Optical Elements Fabricated by Femtosecond Laser Pulses Writing Directly

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